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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details 4) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
New Accounting Pronouncement, Early Adoption [Line Items]      
Total current assets $ 785,570 $ 753,313  
Deferred financing costs 6,616 7,149  
Deferred income taxes - noncurrent 908 36,995  
Total assets 1,248,606 1,213,336 $ 1,095,900
Long-term debt 344,589 294,266  
Total liabilities and stockholders' equity $ 1,248,606 1,213,336  
New Accounting Pronouncement, Early Adoption, Effect [Member]      
New Accounting Pronouncement, Early Adoption [Line Items]      
Deferred income taxes - current   0  
Total current assets   753,313  
Deferred financing costs   0  
Deferred income taxes - noncurrent   36,995  
Total assets   1,213,336  
Long-term debt   294,266  
Total liabilities and stockholders' equity   1,213,336  
Scenario, Previously Reported [Member]      
New Accounting Pronouncement, Early Adoption [Line Items]      
Deferred income taxes - current   20,311  
Total current assets   773,624  
Deferred financing costs   7,149  
Deferred income taxes - noncurrent   16,684  
Total assets   1,220,485  
Long-term debt   301,415  
Total liabilities and stockholders' equity   $ 1,220,485