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Income Taxes (Details 3) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Income Taxes |  |  |
Effective income tax rate (as a percent) | 48.00% | 38.50% | 3.40%
U.S. federal statutory rate (as a percent) | 35.00% |  |
Summary of provision for (benefit from) income taxes in effective tax rates |  |  |
Income taxes at U.S. federal statutory rate of 35% | $ 61,756 | $ (41,615) | $ (120,152)
Net state income taxes | 3,318 | (2,836) | (538)
Foreign taxes | 28,470 | 14,607 | 5,085
Noncontrolling interest | (12,685) | (1,772) | (1,103)
Foreign tax credits | (14,659) | (9,925) | (11,431)
Unrecognized tax benefits | 2,889 | (166) | (741)
Valuation allowances | 21,486 | 14,649 | 62,318
Goodwill impairment |  |  | 53,988
Proceeds from sale of joint venture assets | (6,650) | (18,019) |
Other | 794 | (678) | 857
Provision for (benefit from) income taxes | $ 84,719 | $ (45,755) | $ (11,717)

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