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Common Stock (Details) - USD ($)
 3 Months Ended 12 Months Ended 72 Months Ended
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2016
Oct. 28, 2015
Oct. 23, 2014
Dec. 05, 2013
Sep. 26, 2011
Equity, Class of Treasury Stock [Line Items]                  
Common stock, outstanding (in shares) 59,946,984 59,946,984 61,067,868   59,946,984        
Dividend paid (in dollars per share) $ 0.08                
Stock repurchased (in US dollars)   $ 88,568,000 $ 112,328,000 $ 206,028,000          
Common Stock                  
Equity, Class of Treasury Stock [Line Items]                  
Number of shares repurchased (in shares)         11,400,000        
Stock repurchased (in US dollars)   15,000 $ 24,000 $ 48,000 $ 484,400,000        
Remaining authorized repurchase amount (in US dollars) $ 165,600,000 $ 165,600,000     $ 165,600,000        
Common Stock | RepurchaseProgramSept262011                  
Equity, Class of Treasury Stock [Line Items]                  
Stock repurchase, authorized amount (in US dollars)                 $ 100,000,000
Number of shares repurchased (in shares)   1,500,000              
Stock repurchased (in US dollars)   $ 88,600,000              
Common Stock | RepurchaseProgramDec52013                  
Equity, Class of Treasury Stock [Line Items]                  
Stock repurchase, authorized amount (in US dollars)               $ 100,000,000  
Common Stock | RepurchaseProgramOct232014                  
Equity, Class of Treasury Stock [Line Items]                  
Stock repurchase, authorized amount (in US dollars)             $ 250,000,000    
Common Stock | RepurchaseProgramOct282015                  
Equity, Class of Treasury Stock [Line Items]                  
Stock repurchase, authorized amount (in US dollars)           $ 200,000,000