Income Tax Expense (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Valuation allowance
Valuation allowance	$ 241,156	$ 236,296
Net increase in U.S. and foreign valuation allowances	4,860	1,483
Estimated cumulative amount of earnings from foreign subsidiaries that are permanently reinvested	265,474
Foreign
Valuation allowance
Valuation allowance	18,239	30,067
Deferred Tax Assets | U.S. Federal
Valuation allowance
Valuation allowance	144,264	146,681
Deferred Tax Assets | State
Valuation allowance
Valuation allowance	33,077	29,170
Net operating loss (NOL) carry forwards | Foreign
Valuation allowance
Valuation allowance	$ 45,576	$ 30,378