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

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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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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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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Financial Instruments (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 18, 2018	Nov. 28, 2017	Nov. 27, 2017	Nov. 07, 2017	May 06, 2016	Apr. 08, 2016
Debt Instrument [Line Items]
Principal payments due in next twelve months	$ 1,200
Principal payments due in 2020	1,800
Principal payments due in 2021	1,900
Principal payments due in 2022	501,100
Principal payments due in 2023	2,400
Principal payments due 2023 and thereafter	16,500
Interest paid	$ 18,800	$ 16,000	$ 13,700
Maximum leverage ratio allowed	3.50
Minimum interest coverage ratio required	1.00
Leverage ratio	1.96
Interest coverage ratio	11.59
Credit Agreement [Member]
Debt Instrument [Line Items]
Amount of credit facility							$ 685,000		$ 550,000
Amount of credit facility outstanding	$ 499,000
Additional amount that can be borrowed on facility	$ 186,000
LIBOR spread	1.50%
Interest rate at end of period	3.69%	3.40%
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				2.46%
Amount paid to terminate agreement								$ 5,200
Amount received from terminate agreement						$ 6,300
Credit Agreement [Member] \| Minimum [Member]
Debt Instrument [Line Items]
LIBOR spread	1.25%
Credit Agreement [Member] \| Maximum [Member]
Debt Instrument [Line Items]
LIBOR spread	1.75%
Finance obligations [Member]
Debt Instrument [Line Items]
Interest rate	5.00%
Maturity date	Dec. 31, 2022