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Stock-Based Compensation Performance Share Units Activity (Details) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2016
PSU    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Outstanding, shares, beginning of period (shares)   106,964
Granted (shares) 214,416 295,390 [1]
Vested (shares)   (55,720)
Forfeited (shares)   (8,096)
Outstanding and nonvested, shares, end of period (shares) 340,908 340,908
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Outstanding, weighted average fair value, beginning of period (usd per share)   $ 65.50
Granted, weighted average fair value (usd per share) [1]   21.26
Vested, weighted average fair value (usd per share)   65.06
Forfeited, weighted average fair value (usd per share)   49.85
Outstanding and nonvested, weighted average fair value, end of period (usd per share) $ 27.57 $ 27.57
PSU Dividend Equivalent Unit (DEU)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Granted (shares)   3,578
Dividend equivalent units vested (shares)   (1,009)
Dividend equivalent units forfeited (shares)   (199)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Granted, weighted average fair value (usd per share)   $ 38.93
Dividend equivalent units vested, weighted average fair value (usd per share)   41.64
Dividend equivalent units forfeited, weighted average fair value (usd per share)   $ 39.79
Supplemental Performance Shares    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Granted (shares)   214,416
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Granted, weighted average fair value (usd per share) [1]   $ 16.13
[1] Represents shares of PSUs for which performance targets have been established and which are deemed granted under U.S. GAAP. Includes 214,416 Supplemental PSUs with an average fair value of $16.13 which was determined using a Monte Carlo simulation model, as further described above.