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Share-Based Payments (Narrative) (Details)
3 Months Ended
Aug. 11, 2014
shares
Mar. 31, 2017
USD ($)
item
shares
Stock Option Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation costs | $   $ 8,425,000
Unrecognized compensation costs, period for recognition   2 years 7 months 6 days
Sign-on Grant Performance Share Unit Plans [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of tranches | item   4
Sign-on Grant Performance Share Unit Plans [Member] | Tranche One [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period   2 years
Sign-on Grant Performance Share Unit Plans [Member] | Tranche Two [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period   3 years
Sign-on Grant Performance Share Unit Plans [Member] | Tranche Three [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period   4 years
Sign-on Grant Performance Share Unit Plans [Member] | Tranche Four [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period   5 years
Performance Share Units, Equity Classified Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation costs | $   $ 7,073,000
Unrecognized compensation costs, period for recognition   2 years 1 month 6 days
Units granted | shares   92,934
Performance Share Units, Liability Classified Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation costs | $   $ 7,134,000
Unrecognized compensation costs, period for recognition   2 years 1 month 6 days
Units granted | shares [1]   86,162
Performance Share Units [Member] | Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of units available for grant as a percentage of target   0.00%
Performance Share Units [Member] | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of units available for grant as a percentage of target   200.00%
Performance Share Units [Member] | Sign-on Grant Performance Share Unit Plans [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Units granted | shares 102,375  
Restricted Share Units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation costs | $   $ 118,000
Unrecognized compensation costs, period for recognition   1 year 2 months 12 days
Units granted | shares   749
Deferred Share Units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation costs | $   $ 0
Units granted | shares   4,202
[1] Liability-classified PSUs include PSUs awarded under the employee PSU plan and the previous 2013 PSU plan, in place prior to 2015 that are cash-settled and not subject to market vesting conditions.