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, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]
Net income	$ 105,338	$ 237	$ 6,368	$ 1,738	$ 19,945	$ 1,129	$ 1,270	$ 14,706	$ 113,681	$ 37,050	$ 2,216
Unrealized losses on securities held as available for sale, net of tax:
Unrealized net holding losses arising during the period									0	(32)	(373)
Less: Reclassification adjustment for realized gains included in earnings									0	(230)	(2,467)
Foreign currency translation adjustments									(9,952)	2,969	(3,037)
Comprehensive income (loss)									103,729	39,757	(3,661)
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Net income									113,681	37,050	2,216
Unrealized losses on securities held as available for sale, net of tax:
Unrealized net holding losses arising during the period										0	0
Less: Reclassification adjustment for realized gains included in earnings										0	0
Foreign currency translation adjustments									0	0	0
Comprehensive income (loss)									113,681	37,050	2,216
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net income									140,184	60,688	25,751
Unrealized losses on securities held as available for sale, net of tax:
Unrealized net holding losses arising during the period										(32)	(373)
Less: Reclassification adjustment for realized gains included in earnings										(230)	(2,467)
Foreign currency translation adjustments									0	0	(1)
Comprehensive income (loss)									140,184	60,426	22,910
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net income									984	16,548	1,661
Unrealized losses on securities held as available for sale, net of tax:
Unrealized net holding losses arising during the period										0	0
Less: Reclassification adjustment for realized gains included in earnings										0	0
Foreign currency translation adjustments									(9,955)	2,969	(3,036)
Comprehensive income (loss)									(8,971)	19,517	(1,375)
Consolidating Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net income									(141,168)	(77,236)	(27,412)
Unrealized losses on securities held as available for sale, net of tax:
Unrealized net holding losses arising during the period										0	0
Less: Reclassification adjustment for realized gains included in earnings										0	0
Foreign currency translation adjustments									3	0	0
Comprehensive income (loss)									$ (141,165)	$ (77,236)	$ (27,412)