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Stock-Based Compensation - PRSU, RSU and DSU activity and related information (Details) - Jun. 30, 2015 - USD ($)
$ / shares in Units, shares in Thousands
Total
Total
Performance-based Restricted Stock Units    
Number of Shares    
Beginning balance (in shares)   280
Granted (in shares)   260
Vested (in shares)   0
Forfeited (in shares)   (50)
Ending balance (in shares) 490 490
Weighted- Average Grant Date Fair Value    
Beginning balance (in dollars per share)   $ 53.45
Granted (in dollars per share)   57.52
Vested (in dollars per share)   0.00
Forfeited (in dollars per share)   56.85
Ending balance (in dollars per share) $ 54.36 $ 54.36
Aggregate Intrinsic Value $ 32,400,000 $ 32,400,000
Maximum number of shares to be awarded (in shares) 780 780
Aggregate intrinsic value   $ 0
Performance-based Restricted Stock Units | Performance period ending December 31, 2017    
Weighted- Average Grant Date Fair Value    
Award performance period   3 years
Restricted Stock Units And Deferred Stock Units    
Number of Shares    
Beginning balance (in shares)   110
Granted (in shares)   0
Vested (in shares)   (60)
Forfeited (in shares)   0
Ending balance (in shares) 50 50
Weighted- Average Grant Date Fair Value    
Beginning balance (in dollars per share)   $ 50.41
Granted (in dollars per share)   58.98
Vested (in dollars per share)   49.27
Forfeited (in dollars per share)   49.63
Ending balance (in dollars per share) $ 52.11 $ 52.11
Aggregate Intrinsic Value $ 3,500,000 $ 3,500,000
Restricted Stock Units (RSUs)    
Weighted- Average Grant Date Fair Value    
Aggregate intrinsic value $ 600,000 $ 3,700,000
Vesting period (in years)   3 years
Deferred Stock Units (DSU)    
Weighted- Average Grant Date Fair Value    
Vesting period (in years)   1 year