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Recently Adopted Standards and Issued Accounting Standards (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
New Accounting Pronouncement, Early Adoption [Line Items]        
Unrecognized Tax Benefits $ 1,088 $ 2,665 $ 5,011 $ 7,024
Reclassification of tax effects from AOCI to retained earnings 19,370      
Share Based Compensation Arrangements [Member] | Deferred Tax Asset        
New Accounting Pronouncement, Early Adoption [Line Items]        
Unrecognized Tax Benefits     $ 14,700  
Adjustments for New Accounting Pronouncement [Member]        
New Accounting Pronouncement, Early Adoption [Line Items]        
Revenues 20,000      
AOCI        
New Accounting Pronouncement, Early Adoption [Line Items]        
Reclassification of tax effects from AOCI to retained earnings 19,370      
AOCI | Accounting Standards Update 2018-02        
New Accounting Pronouncement, Early Adoption [Line Items]        
Reclassification of tax effects from AOCI to retained earnings 19,400      
Retained Earnings        
New Accounting Pronouncement, Early Adoption [Line Items]        
Reclassification of tax effects from AOCI to retained earnings (19,370)      
Retained Earnings | Accounting Standards Update 2018-02        
New Accounting Pronouncement, Early Adoption [Line Items]        
Reclassification of tax effects from AOCI to retained earnings $ (19,400)