Amount paid to terminate agreement.

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Amount received from terminate agreement.

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Covenant, Maximum Leverage Ratio.

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Covenant, Minimum Interest Coverage Ratio.

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- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate.

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Final principal repayment made under Prudential Agreement.

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Interest Coverage Ratio.

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Leverage Ratio.

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Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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

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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.

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Fixed interest rate related to the interest rate derivative.

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Amount of cash paid for interest. Includes, but is not limited to, payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

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-Name Accounting Standards Codification
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-SubTopic 10
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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.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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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.

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

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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.

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Financial Instruments (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 18, 2017	Nov. 28, 2017	Nov. 27, 2017	Nov. 07, 2017	May 06, 2016	Apr. 08, 2016
Debt Instrument [Line Items]
Principal payments due in 2019	$ 1,900
Principal payments due in 2020	2,000
Principal payments due in 2021	2,100
Principal payments due in 2022	50,810
Interest paid	$ 16,000	$ 13,700	$ 12,600
Maximum leverage ratio allowed	3.75
Minimum interest coverage ratio required	3.00
Leverage ratio	2.62
Interest coverage ratio	9.27
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Interest rate		5.00%
Maturity date	Dec. 31, 2022
Private Placement, Notes [Member]
Debt Instrument [Line Items]
Interest rate	6.84%	6.84%
Maturity date	Oct. 25, 2017
Final principal repayment made under Prudential Agreement	$ 50,000
Revolving Credit Agreement [Member]
Debt Instrument [Line Items]
Amount of credit facility							$ 685,000		$ 550,000
Amount of credit facility outstanding	501,000
Additional amount that can be borrowed on facility	$ 184,000
LIBOR spread	1.50%
Interest rate at end of period	3.40%	2.58%
Revolving Credit Agreement [Member] \| Interest Rate Swap [Member]
Debt Instrument [Line Items]
Borrowings, revolving credit facility						$ 300,000		$ 120,000
Notional amount				$ 350,000	$ 350,000
Fixed interest rate in swap				3.61%	2.11%
LIBOR rate				1.50%
Amount paid to terminate agreement								$ 5,200
Amount received from terminate agreement						$ 6,300
Revolving Credit Agreement [Member] \| Minimum [Member]
Debt Instrument [Line Items]
LIBOR spread	1.25%
Revolving Credit Agreement [Member] \| Maximum [Member]
Debt Instrument [Line Items]
LIBOR spread	1.75%