Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Schedule of Repurchase Agreements (Parenthetical) (Details)

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Stockholders' Equity - Schedule of Repurchase Agreements (Parenthetical) (Details) - USD ($)
shares in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Dec. 31, 2014
May. 31, 2014
Class Of Stock [Line Items]          
Treasury stock $ 35,795,000   $ 35,795,000 $ 26,034,000  
Common Stock [Member]          
Class Of Stock [Line Items]          
Common stock shares received 286,067        
Common Stock [Member] | May 2014 ASR Agreement [Member]          
Class Of Stock [Line Items]          
Stock repurchase program, authorized amount         $ 600,000,000
Number of shares repurchased and retired   112,500      
Common stock shares received     39,346    
Stock repurchase program, unused portion of authorized amount $ 93,596,000   $ 93,596,000