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Equity - Narrative (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2007
Right
Dec. 31, 2016
$ / shares
shares
Sep. 30, 2016
$ / shares
Jun. 30, 2016
$ / shares
Mar. 31, 2016
$ / shares
Dec. 31, 2015
$ / shares
shares
Sep. 30, 2015
$ / shares
Jun. 30, 2015
$ / shares
Mar. 31, 2015
$ / shares
Dec. 31, 2014
$ / shares
Dec. 31, 2016
$ / shares
shares
Mar. 21, 2007
$ / shares
Equity [Abstract]                        
Authorized capitalization of common stock (in shares)   300,000,000       300,000,000         300,000,000  
Common stock, par value (in dollars per share) | $ / shares   $ 0.01       $ 0.01         $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares)   3,500,000       3,500,000         3,500,000  
Preferred stock, par value (in dollars per share) | $ / shares   $ 0.01       $ 0.01         $ 0.01  
Preferred shares issued (in shares)   0                 0  
Number of rights per common stock share distributed as dividends | Right 1                      
Number of shares of common stock the registered holder of each right is entitled to purchase when exercisable (in shares)   1                 1  
Purchase price of each common stock share following the exercise of rights (in dollars per share) | $ / shares   $ 110.00                 $ 110.00  
Dividends per common share (in dollars per share) | $ / shares   $ 0 $ 0 $ 0 $ 0 $ 0.08 $ 0 $ 0 $ 0 $ 0.08 $ 0  
Number of shares authorized to be repurchased (in shares) (up to)   2,400,000.0                 2,400,000.0