Supplemental Guarantors Consolidating Condensed Financial Information (Statement of Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	$ 1,270	$ (5,026)	$ 15,976	$ (4,515)
Unrealized loss on securities held as available for sale, net of tax:
Unrealized net holding loss arising during the period	(117)	(1,000)	(32)	(177)
Less: Reclassification adjustment for realized gains included in earnings	(230)	(980)	(230)	(2,467)
Foreign currency translation adjustments	(2,895)	1,143	(339)	4,434
Comprehensive income (loss)	(1,972)	(5,863)	15,375	(2,725)
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)			15,976	(4,515)
Unrealized loss on securities held as available for sale, net of tax:
Unrealized net holding loss arising during the period			0	0
Less: Reclassification adjustment for realized gains included in earnings			0	0
Foreign currency translation adjustments			0	0
Comprehensive income (loss)			15,976	(4,515)
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)			22,523	6,671
Unrealized loss on securities held as available for sale, net of tax:
Unrealized net holding loss arising during the period			(32)	(177)
Less: Reclassification adjustment for realized gains included in earnings			(230)	(2,467)
Foreign currency translation adjustments			0	(1)
Comprehensive income (loss)			22,261	4,026
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)			9,735	354
Unrealized loss on securities held as available for sale, net of tax:
Unrealized net holding loss arising during the period			0	0
Less: Reclassification adjustment for realized gains included in earnings			0	0
Foreign currency translation adjustments			(339)	4,435
Comprehensive income (loss)			9,396	4,789
Consolidating Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)			(32,258)	(7,025)
Unrealized loss on securities held as available for sale, net of tax:
Unrealized net holding loss arising during the period			0	0
Less: Reclassification adjustment for realized gains included in earnings			0	0
Foreign currency translation adjustments			0	0
Comprehensive income (loss)			$ (32,258)	$ (7,025)