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Supplemental Guarantors Consolidating Condensed Financial Information - (Statement of Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items]
Net income	$ 725us-gaap_NetIncomeLoss	$ 4,486us-gaap_NetIncomeLoss	$ 2,575us-gaap_NetIncomeLoss	$ 1,892us-gaap_NetIncomeLoss	$ 105,338us-gaap_NetIncomeLoss	$ 237us-gaap_NetIncomeLoss	$ 6,368us-gaap_NetIncomeLoss	$ 1,738us-gaap_NetIncomeLoss	$ 9,678us-gaap_NetIncomeLoss	$ 113,681us-gaap_NetIncomeLoss	$ 37,050us-gaap_NetIncomeLoss
Unrealized losses on securities held as available for sale, net of tax:
Unrealized net holding losses arising during the period									0	0	(32)
Less: Reclassification adjustment for realized gains included in earnings									0	0	(230)
Foreign currency translation adjustments									(12,081)	(9,952)	2,969
Comprehensive income (loss)									(2,403)us-gaap_ComprehensiveIncomeNetOfTax	103,729us-gaap_ComprehensiveIncomeNetOfTax	39,757us-gaap_ComprehensiveIncomeNetOfTax
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Net income									9,678	113,681	37,050
Unrealized losses on securities held as available for sale, net of tax:
Unrealized net holding losses arising during the period											0
Less: Reclassification adjustment for realized gains included in earnings											0
Foreign currency translation adjustments									0	0	0
Comprehensive income (loss)									9,678	113,681	37,050
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net income									23,901	140,184	60,688
Unrealized losses on securities held as available for sale, net of tax:
Unrealized net holding losses arising during the period											(32)
Less: Reclassification adjustment for realized gains included in earnings											(230)
Foreign currency translation adjustments									0	0	0
Comprehensive income (loss)									23,901	140,184	60,426
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net income									(5,452)	984	16,548
Unrealized losses on securities held as available for sale, net of tax:
Unrealized net holding losses arising during the period											0
Less: Reclassification adjustment for realized gains included in earnings											0
Foreign currency translation adjustments									(12,096)	(9,955)	2,969
Comprehensive income (loss)									(17,548)	(8,971)	19,517
Consolidating Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net income									(18,449)	(141,168)	(77,236)
Unrealized losses on securities held as available for sale, net of tax:
Unrealized net holding losses arising during the period											0
Less: Reclassification adjustment for realized gains included in earnings											0
Foreign currency translation adjustments									15	3	0
Comprehensive income (loss)									$ (18,434)	$ (141,165)	$ (77,236)