XML 66 R56.htm IDEA: XBRL DOCUMENT v3.8.0.1
Summary of Significant Accounting Policies Balance Sheet Adjustments (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 1,097,227 $ 930,180 $ 501,837 $ 438,087
Accrued liabilities 255,146 257,554    
Deferred income taxes 86,657 81,454    
Retained earnings (accumulated deficit) 164,425 (23,824)    
As Previously Reported [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Accrued liabilities 248,979 251,082    
Deferred income taxes 89,075 83,980    
Retained earnings (accumulated deficit) 168,174 (19,878)    
Adjustments [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 3,800      
Accrued liabilities 6,167 6,472    
Deferred income taxes (2,418) (2,526)    
Retained earnings (accumulated deficit) $ (3,749) $ (3,946)