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Long-Term Debt (Additional Required Disclosures) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
2027 Notes [Member]
Debt Instrument [Line Items]
Interest Expense	$ 11,547	$ 0	$ 0
Amortization of financing costs	224	0	0
Amortization of Premium and Amortization of (Discount)	0	0	0
2023 Senior Notes [Member]
Debt Instrument [Line Items]
Interest Expense	23,885	28,516	31,387
Amortization of financing costs	610	943	439
Amortization of Premium and Amortization of (Discount)	(752)	(1,157)	(515)
2016 Notes [Member]
Debt Instrument [Line Items]
Interest Expense	0	6,668	20,991
Amortization of financing costs	0	391	805
Amortization of Premium and Amortization of (Discount)	0	(266)	(496)
Subsidiaries [Member] | Secured Loan Agreement [Member]
Debt Instrument [Line Items]
Interest Expense	2,570	6,519	0
Amortization of financing costs	3,251	814	0
Amortization of Premium and Amortization of (Discount)	$ (2,249)	$ 0	$ 0

X

- Definition

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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