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Income Taxes (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Taxes (Textual) [Abstract]        
U.S. federal statutory corporate tax rate 35.00% 35.00% 35.00%  
Provision for income taxes $ 80,306 $ 88,172 $ 71,396  
Effective tax rate 35.30% 48.40% 43.40% 40.60%
Deferred Tax Liabilities, Net, Noncurrent $ 161,502 $ 136,644    
Provision for deferred taxes on undistributed earnings 46,000      
Foreign earnings potential tax 5,900      
No unrecognized tax benefits 0 $ 0    
Foreign [Member]        
Income Taxes (Textual) [Abstract]        
Operating Loss Carryforwards 104,900      
State [Member]        
Income Taxes (Textual) [Abstract]        
Operating Loss Carryforwards $ 252,600      
Minimum [Member]        
Income Taxes (Textual) [Abstract]        
Operating Loss Carryforwards, Expiration Dates Dec. 31, 2017      
Maximum [Member]        
Income Taxes (Textual) [Abstract]        
Operating Loss Carryforwards, Expiration Dates Dec. 31, 2036