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Share-based Compensation Summary of Restricted Stock and Performance Unit Award Activity (Details) - 6 months ended Jun. 30, 2015 - $ / shares
Total
Restricted Stock  
Restricted stock and performance unit award activity (shares) [Roll Forward]  
Outstanding at January 1, 2015 1,184,299
Granted 205,462
Vested (349,451)
Forfeitures (4,537)
Outstanding at June 30, 2015 1,035,773
Restricted stock and performance unit award activity (weighted average grant-date fair value) [Abstract]  
Weighted average grant-date fair value of outstanding shares at January 1, 2015 $ 41.71
Weighted average grant-date fair value of shares granted 65.25
Weighted average grant-date fair value of shares vested 29.37
Weighted average grant-date fair value of shares forfeitures 65.79
Weighted average grant-date fair value of outstanding shares at March 31, 2015 $ 49.82
Performance Units  
Restricted stock and performance unit award activity (shares) [Roll Forward]  
Outstanding at January 1, 2015 127,489
Granted 47,512
Vested 0
Forfeitures 0
Outstanding at June 30, 2015 175,001
Restricted stock and performance unit award activity (weighted average grant-date fair value) [Abstract]  
Weighted average grant-date fair value of outstanding shares at January 1, 2015 $ 58.25
Weighted average grant-date fair value of shares granted 65.17
Weighted average grant-date fair value of shares vested 0.00
Weighted average grant-date fair value of shares forfeitures 0.00
Weighted average grant-date fair value of outstanding shares at March 31, 2015 $ 60.13