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Income Taxes (Income Tax Reconciliation and Unrecognized Tax Benefits) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Effective Income Tax Rate Reconciliation, Amount [Abstract]          
Income before income taxes and equity in net income of unconsolidated entities $ (18,882) $ 46,695 $ 20,515 $ 88,200  
Equity in net income of unconsolidated entities 497 360 1,096 857  
Net (income) loss attributable to the noncontrolling interest 5 21 35 64  
Total (18,380) 47,076 21,646 89,121  
Income tax expense (8,611) 15,955 5,039 28,382  
Effective income tax rate 46.80% 33.90% 23.30% 31.80%  
Effective income tax rate reconciliation, change in percentage points compared with prior year period   12.9      
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued [Abstract]          
Current liabilities 4,490   4,490   6,211
Non-current liabilities 6,712   6,712   6,012
Total liability for unrecognized tax benefits $ 11,202   $ 11,202   $ 12,223