Guarantor Non-Guarantor - (Statement of Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	$ 19,945	$ 1,129	$ 1,270	$ 14,706	$ 11,842	$ (5,111)	$ (5,026)	$ 511	$ 37,050	$ 2,216	$ (63,417)
Unrealized loss on securities held as available for sale, net of tax:
Unrealized net holding gains (losses) arising during the period									(32)	(373)	4,117
Less: Reclassification adjustment for realized gains included in earnings									(230)	(2,467)	(4,188)
Foreign currency translation adjustments									2,969	(3,037)	6,948
Comprehensive income (loss)									39,757	(3,661)	(56,540)
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)									37,050	2,216	(63,417)
Unrealized loss on securities held as available for sale, net of tax:
Unrealized net holding gains (losses) arising during the period									0	0	0
Less: Reclassification adjustment for realized gains included in earnings									0	0	0
Foreign currency translation adjustments									0	0	0
Comprehensive income (loss)									37,050	2,216	(63,417)
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)									60,688	25,751	(40,085)
Unrealized loss on securities held as available for sale, net of tax:
Unrealized net holding gains (losses) arising during the period									(32)	(373)	4,117
Less: Reclassification adjustment for realized gains included in earnings									(230)	(2,467)	(4,188)
Foreign currency translation adjustments									0	(1)	1
Comprehensive income (loss)									60,426	22,910	(40,155)
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)									16,548	1,661	(9,896)
Unrealized loss on securities held as available for sale, net of tax:
Unrealized net holding gains (losses) arising during the period									0	0	0
Less: Reclassification adjustment for realized gains included in earnings									0	0	0
Foreign currency translation adjustments									2,969	(3,036)	6,947
Comprehensive income (loss)									19,517	(1,375)	(2,949)
Consolidating Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)									(77,236)	(27,412)	49,981
Unrealized loss on securities held as available for sale, net of tax:
Unrealized net holding gains (losses) arising during the period									0	0	0
Less: Reclassification adjustment for realized gains included in earnings									0	0	0
Foreign currency translation adjustments									0	0	0
Comprehensive income (loss)									$ (77,236)	$ (27,412)	$ 49,981