Supplemental Guarantors Consolidating Condensed Financial Information (Statement of Comprehensive Income (Loss)) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Condensed Financial Statements, Captions [Line Items]
Net income	$ 1,738	$ 14,706
Unrealized loss on securities held as available for sale, net of tax:
Unrealized gains on securities held as available for sale, net of tax	0	85
Foreign currency translation adjustments	(3,077)	2,556
Comprehensive income (loss)	(1,339)	17,347
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Net income	1,738	14,706
Unrealized loss on securities held as available for sale, net of tax:
Unrealized gains on securities held as available for sale, net of tax		0
Foreign currency translation adjustments	0	0
Comprehensive income (loss)	1,738	14,706
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net income	11,358	17,204
Unrealized loss on securities held as available for sale, net of tax:
Unrealized gains on securities held as available for sale, net of tax		85
Foreign currency translation adjustments	0	0
Comprehensive income (loss)	11,358	17,289
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net income	2,296	8,916
Unrealized loss on securities held as available for sale, net of tax:
Unrealized gains on securities held as available for sale, net of tax		0
Foreign currency translation adjustments	(3,077)	2,556
Comprehensive income (loss)	(781)	11,472
Consolidating Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net income	(13,654)	(26,120)
Unrealized loss on securities held as available for sale, net of tax:
Unrealized gains on securities held as available for sale, net of tax		0
Foreign currency translation adjustments	0	0
Comprehensive income (loss)	$ (13,654)	$ (26,120)