Quarterly report pursuant to Section 13 or 15(d)

Stock Repurchase Programs (Details)

v2.4.1.9
Stock Repurchase Programs (Details) (USD $)
Share data in Millions, unless otherwise specified
0 Months Ended 1 Months Ended 3 Months Ended
Dec. 31, 2014
Jun. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Stock Repurchase Programs        
Stock repurchase programs, authorized amount   $ 275,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount    
Common shares repurchased     0.8us-gaap_StockRepurchasedDuringPeriodShares 0.5us-gaap_StockRepurchasedDuringPeriodShares
Common shares repurchased, cost     30,618,000us-gaap_StockRepurchasedDuringPeriodValue 22,492,000us-gaap_StockRepurchasedDuringPeriodValue
Amount remaining available for future stock repurchases $ 104,600,000us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount