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Common Stock Repurchase Plans (Details) - USD ($)
$ / shares in Units, shares in Millions
 1 Months Ended 6 Months Ended 9 Months Ended
Apr. 30, 2015
Nov. 30, 2014
Apr. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Stockholders' Equity Note [Abstract]          
Stock repurchase program, authorized amount $ 50,000,000.0 $ 100,000,000 $ 50,000,000.0    
Payments for repurchase of common stock   $ 100,000,000   $ 50,000,000 $ 95,255,000
Acquisition of treasury stock (in shares) 1.8 6.5 8.3 4.0  
Share repurchase plan, percent of common shares outstanding, expected to be delivered   80.00%      
Treasury stock aquired, average cost per share $ 12.05     $ 12.57  
Stock repurchase plan, authorized amount 2.30%