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

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(a)(1))
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
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Amount, after accumulated amortization, of debt premium.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
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Debt - Long Term Debt (Parenthetical) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Feb. 27, 2017	Jan. 17, 2017	Dec. 31, 2016	Jul. 27, 2016	Jan. 29, 2015	Nov. 09, 2012
6.125% Due 2022 [Member]
Long term Debt [Abstract]
Interest rate	6.125%
5.625 % Due 2024 [Member]
Long term Debt [Abstract]
Interest rate	5.625%
Notes Payable to Banks [Member] \| Term Loans [Member]
Long term Debt [Abstract]
Debt financing costs and discount	$ 57,547			$ 6,592
Senior Subordinated Notes [Member] \| 6.875 % Due 2020 [Member]
Long term Debt [Abstract]
Debt financing costs and discount				$ 4,295
Interest rate	6.875%	6.875%		6.875%			6.875%
Senior Subordinated Notes [Member] \| 6.125% Due 2022 [Member]
Long term Debt [Abstract]
Debt financing costs and discount	$ 1,992			$ 2,402
Interest rate	6.125%			6.125%		6.125%
Senior Subordinated Notes [Member] \| 5.875% Due 2022 [Member]
Long term Debt [Abstract]
Debt financing costs and discount	$ 8,102
Interest rate	5.875%		5.875%	5.875%
Senior Subordinated Notes [Member] \| 5.625 % Due 2024 [Member]
Long term Debt [Abstract]
Debt financing costs and discount	$ 13,525			$ 15,090
Interest rate	5.625%			5.625%	5.625%