Debt instrument maturity year.

No definition available.

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- Definition

Line of Credit, Additional Applicable Rate Added to Base Rate, At End of Period

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Line of Credit, Additional Applicable Rate Added to Base Rate, Minimum

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Line of credit, amount available to increase borrowing capacity.

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Long Term-Debt, Maturities, Repayment of Principal in Year Nine

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Long-Term Debt, Maturities, Repayment of Principal in Year Seven

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Long-Term Debt, Maturities, Repayment of Principal in Year Six

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Long term debt refinanced amount.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	duration

- Definition

Number of tranches.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

+ References

+ Details

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Data Type:	xbrli:stringItemType
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Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
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Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(13))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04.(a))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690

+ Details

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- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04.(a))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

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Period Type:	instant

- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

+ Details

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Period Type:	instant

- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

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- Details

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- Details

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Balance Type:
Period Type:

- Details

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Balance Type:
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Debt (Narrative) (Details)	12 Months Ended
Debt (Narrative) (Details)	Dec. 31, 2017 USD ($) Tranche	Dec. 31, 2016 USD ($)	Dec. 31, 2009 USD ($)	Feb. 14, 2018 USD ($)	Dec. 31, 2014 USD ($)
Debt Instrument [Line Items]
Number of Tranches Included in Term Loan \| Tranche	8
Long-term Debt, Maturities, Repayments of Principal in Year Three	$ 46,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Two	190,000,000
Long-term Debt, Maturities, Repayment of Principal in Year Four	40,000,000
Long-term Debt, Maturities, Repayment of Principal in Year Five	$ 43,000,000
Debt instrument maturity date, description	due 2018 through 2022
Amount Available to Increase Borrowing Capacity					$ 250,000,000
Revolving line of credit borrowings	$ 0
Remaining Borrowing Capacity	$ 249,100,000
Scenario, Forecast [Member]
Debt Instrument [Line Items]
Amount Available to Increase Borrowing Capacity				$ 420,000,000
Line of Credit [Member]
Debt Instrument [Line Items]
Maximum Borrowing Capacity					250,000,000
Additional Applicable Rate Added to Base Rate, Minimum		1.50%
Additional Applicable Rate Added to Base Rate, At End of Period		0.50%
Unused Capacity, Commitment Fee Percentage	0.25%
Line of Credit [Member] \| Scenario, Forecast [Member]
Debt Instrument [Line Items]
Maximum Borrowing Capacity				380,000,000
Letter of Credit [Member]
Debt Instrument [Line Items]
Maximum Borrowing Capacity					40,000,000
Line of Credit Facility, Amount Outstanding	$ 900,000
Letter of Credit [Member] \| Scenario, Forecast [Member]
Debt Instrument [Line Items]
Maximum Borrowing Capacity				75,000,000
Swing Line Loan [Member]
Debt Instrument [Line Items]
Maximum Borrowing Capacity					$ 25,000,000
Swing Line Loan [Member] \| Scenario, Forecast [Member]
Debt Instrument [Line Items]
Maximum Borrowing Capacity				$ 25,000,000
Revenue Bonds [Member]
Debt Instrument [Line Items]
Interest Rate		2.75%
Long-term Debt, refinancing amount		$ 65,700
Term Loans [Member]
Debt Instrument [Line Items]
Repayments of debt	6,000,000
Senior Notes [Member]
Debt Instrument [Line Items]
Interest Rate			7.50%
Proceeds from Issuance of Debt			$ 150,000,000
Medium Term Notes [Member]
Debt Instrument [Line Items]
Repayments of debt	$ 5,000,000
Minimum [Member] \| Medium Term Notes [Member]
Debt Instrument [Line Items]
Interest Rate	8.75%
Maximum [Member] \| Medium Term Notes [Member]
Debt Instrument [Line Items]
Interest Rate	8.89%
London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.00%
Federal Fund Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.50%
Eurodollar [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.875%
Eurodollar [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.70%
Base Rate [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.00%
Base Rate [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.70%
Term Loan, Tranche One [Member]
Debt Instrument [Line Items]
Number of Tranches Included in Term Loan \| Tranche	1
Term Loan, Tranche One [Member] \| Term Loans [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Year Three	$ 6,000,000
Term Loan, Tranche One [Member] \| Debt Instrument, Redemption, Period Two [Member] \| Term Loans [Member]
Debt Instrument [Line Items]
Interest Rate	3.70%
Term Loan, Tranche Two [Member] \| Term Loans [Member]
Debt Instrument [Line Items]
Number of Tranches Included in Term Loan \| Tranche	3
Long-term Debt, Maturities, Repayments of Principal in Year Three	$ 40,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Two	40,000,000
Long-term Debt, Maturities, Repayment of Principal in Year Four	$ 40,000,000
Term Loan, Tranche Two [Member] \| LIBOR [Member] \| Minimum [Member] \| Term Loans [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.65%
Term Loan, Tranche Two [Member] \| LIBOR [Member] \| Maximum [Member] \| Term Loans [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.90%
Term Loan, Tranche Three [Member] \| Term Loans [Member]
Debt Instrument [Line Items]
Number of Tranches Included in Term Loan \| Tranche	2
Long-term Debt, Maturities, Repayment of Principal in Year Five	$ 40,000,000
Long-term Debt, Maturities, Repayment of Principal in Year Six	$ 40,000,000
Term Loan, Tranche Three [Member] \| Debt Instrument, Redemption, Period Two [Member] \| Term Loans [Member]
Debt Instrument [Line Items]
Interest Rate	4.49%
Term Loan, Tranche Three [Member] \| Debt Instrument, Redemption, Period One \| Term Loans [Member]
Debt Instrument [Line Items]
Interest Rate	4.29%
Term Loan, Tranche Four [Member] \| Term Loans [Member]
Debt Instrument [Line Items]
Number of Tranches Included in Term Loan \| Tranche	1
Long-term Debt, Maturities, Repayment of Principal in Year Seven	$ 110,000,000
Term Loan, Tranche Four [Member] \| Debt Instrument, Redemption, Period One \| Term Loans [Member]
Debt Instrument [Line Items]
Interest Rate	4.64%
Term Loan, Tranche Five [Member]
Debt Instrument [Line Items]
Number of Tranches Included in Term Loan \| Tranche	1
Long-term Debt, Maturities, Repayment of Principal in Year Nine	$ 27,500,000
Term Loan, Tranche Five [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Interest Rate	2.15%
2026 Maturity [Member] \| Revenue Bonds [Member]
Debt Instrument [Line Items]
Repayments of debt		$ 42,600,000
Interest Rate		5.90%
Debt instrument maturity date		2026
2024 Maturity [Member] \| Revenue Bonds [Member]
Debt Instrument [Line Items]
Interest Rate		6.00%
Debt instrument maturity date		2024