Consolidated Statements Of Equity (USD $) Share data in Thousands, unless otherwise specified	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income	Total	Noncontrolling Interest
Beginning Balance at Dec. 31, 2009	$ 911,695,000	$ 46,000	$ 709,354,000	$ 196,950,000	$ 622,000	$ 906,972,000	$ 4,723,000
Beginning Balance (in shares) at Dec. 31, 2009		45,431
Stock-based compensation	7,377,000		7,377,000			7,377,000
Cumulative effect of adopting the guidance on evaluation of credit derivatives embedded in beneficial interests in securitized financial assets (Accounting Standards Update 2010-11)				(693,000)	693,000
Increase in noncontrolling interest, due to acquisition	1,462,000						1,462,000
Cash dividend declared, $0.08 per share in 2012, $0.13 per share in 2011 and $0.27 per share in 2010	(12,264,000)			(12,264,000)		(12,264,000)
Net income (loss)	37,228,000			37,318,000		37,318,000	(90,000)
Other comprehensive income (loss), net of related taxes:
Currency translation adjustment	43,000				43,000	43,000
Amortization of unrealized gains in respect of derivative instruments designated for cash flow hedge (net of related tax of $117 in 2012, $130 in 2011 and $143 in 2010)	(234,000)				(234,000)	(234,000)
Change in unrealized gains or losses on marketable securities available-for-sale (net of related tax of $0 in 2012, $0 in 2011 and $43 in 2010)	(80,000)				(80,000)	(80,000)
Ending Balance at Dec. 31, 2010	945,227,000	46,000	716,731,000	221,311,000	1,044,000	939,132,000	6,095,000
Ending Balance (in shares) at Dec. 31, 2010		45,431
Stock-based compensation	6,672,000		6,672,000			6,672,000
Increase in noncontrolling interest due to sale of equity	3,842,000		2,343,000			2,343,000	1,499,000
Cash dividend declared, $0.08 per share in 2012, $0.13 per share in 2011 and $0.27 per share in 2010	(5,924,000)			(5,924,000)		(5,924,000)
Net income (loss)	(42,724,000)			(43,056,000)		(43,056,000)	332,000
Other comprehensive income (loss), net of related taxes:
Amortization of unrealized gains in respect of derivative instruments designated for cash flow hedge (net of related tax of $117 in 2012, $130 in 2011 and $143 in 2010)	(212,000)				(212,000)	(212,000)
Change in unrealized gains or losses on marketable securities available-for-sale (net of related tax of $0 in 2012, $0 in 2011 and $43 in 2010)	(237,000)				(237,000)	(237,000)
Ending Balance at Dec. 31, 2011	906,644,000	46,000	725,746,000	172,331,000	595,000	898,718,000	7,926,000
Ending Balance (in shares) at Dec. 31, 2011		45,431
Stock-based compensation	6,394,000		6,394,000			6,394,000
Cash paid to noncontrolling interest	(1,244,000)						(1,244,000)
Cash dividend declared, $0.08 per share in 2012, $0.13 per share in 2011 and $0.27 per share in 2010	(3,636,000)			(3,636,000)		(3,636,000)
Net income (loss)	(206,016,000)			(206,430,000)		(206,430,000)	414,000
Other comprehensive income (loss), net of related taxes:
Amortization of unrealized gains in respect of derivative instruments designated for cash flow hedge (net of related tax of $117 in 2012, $130 in 2011 and $143 in 2010)	(190,000)				(190,000)	(190,000)
Change in unrealized gains or losses on marketable securities available-for-sale (net of related tax of $0 in 2012, $0 in 2011 and $43 in 2010)	246,000				246,000	246,000
Ending Balance at Dec. 31, 2012	$ 702,198,000	$ 46,000	$ 732,140,000	$ (37,735,000)	$ 651,000	$ 695,102,000	$ 7,096,000
Ending Balance (in shares) at Dec. 31, 2012		45,431