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Long-Term Debt (Additional Required Disclosures) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
2023 Senior Notes [Member]
Debt Instrument [Line Items]
Interest Expense	$ 28,516	$ 31,387	$ 31,387
Amortization of financing costs	943	439	438
Amortization of Premium and Amortization of (Discount)	1,157	515	506
2016 Notes [Member]
Debt Instrument [Line Items]
Interest Expense	6,668	20,991	29,490
Amortization of financing costs	391	805	778
Amortization of Premium and Amortization of (Discount)	(266)	(496)	(692)
Subsidiaries [Member] | Secured Loan Agreement [Member]
Debt Instrument [Line Items]
Interest Expense	6,519	0	0
Amortization of financing costs	$ 814	$ 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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-Publisher FASB
-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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-Section S99
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Amount of amortization expense attributable to debt issuance costs.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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