Long-Term Debt (Details)						1 Months Ended	3 Months Ended				1 Months Ended
	Mar. 31, 2012 7.875% senior subordinated notes due 2016 USD ($)	Mar. 31, 2012 8.125% senior subordinated notes due 2018 USD ($)	Mar. 31, 2012 9.25% senior subordinated notes due 2019 USD ($)	Apr. 26, 2012 Letter of Credit [Member] USD ($)	Jan. 17, 2012 Letter of Credit [Member] USD ($)	Apr. 30, 2012 China Loans CNY	Mar. 31, 2012 China Loans CNY	Mar. 31, 2012 Credit agreement USD ($)	Mar. 31, 2012 Credit agreement Federal funds effective rate	Mar. 31, 2012 Credit agreement LIBOR	Feb. 21, 2012 Secured senior term loan and revolving credit facility USD ($)	Mar. 31, 2012 Secured senior term loan and revolving credit facility USD ($)	Mar. 31, 2012 Senior secured revolving credit facility USD ($)	Mar. 31, 2012 Senior secured term loan credit facility USD ($)
Debt Instrument
Debt Instrument, Description of Variable Rate Basis									Federal funds effective rate	One month LIBOR
Line of Credit Facility, Maximum Borrowing Capacity												$ 250,000,000
Line of Credit Facility, Amount Outstanding													0	564,128,000
Letters of Credit Outstanding, Amount													60,920,000
Amount available under credit facility													189,080,000
Minimum Proceeds from Sale of Assets That would Require Prepayment of Debt								5,000
Debt Instrument Refinanced Amount											16,400,000
Debt Instrument, Consent Fees											57,000
Long-term Debt and Capital Lease Obligations Current and Non-current	200,000,000	250,000,000	345,623,000				166,000,000							564,128,000
Debt Instrument, interest rate, stated percentage	7.875%	8.125%												9.25%
Redeemed aggregate principal amount						106,000,000	12,500,000
Reduction of Letter of Credit					1,000,000
Letter of Credit Returned				$ 18,000,000