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Equity Awards - Restricted Shares Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted shares issued related to director fee deferrals 4,368    
Restricted Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Unvested Restricted Shares Granted 500,675    
Unrecognized unvested restricted shares-based compensation expense $ 14,600    
Weighted-average period for recognition of the unrecognized unvested restricted shares-based compensation expense 2 years 3 months    
Restricted shares-based compensation expense $ 2,000 $ 2,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 61,573    
Plan 1 [Member] | Service-based restriced shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Unvested Restricted Shares Granted 217,818    
Award requisite service period 3 years    
Plan 2 [Member] | Service-based restriced shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Unvested Restricted Shares Granted 42,740    
Award requisite service period 1 year    
Cash value of incentive plan 80.00%    
Restriced shares value of incentive plan 20.00%    
Plan 4 [Member] | Service-based restriced shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Unvested Restricted Shares Granted 600    
Award requisite service period 1 year    
Plan 5 [Member] | Service-based restriced shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award requisite service period 1 year    
Plan 5 [Member] | Service-based restriced shares [Member] | Non-employee independent director [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Unvested Restricted Shares Granted 41,174    
Plan 8 [Member] | Performance-based restriced shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Unvested Restricted Shares Granted 193,975    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 0.9586%    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate 35.80%    
Minimum [Member] | Plan 2 [Member] | Service-based restriced shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
ICP, Threshold target for granting stock awards $ 20    
Total shareholder return metric [Member] | Minimum [Member] | Plan 8 [Member] | Performance-based restriced shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award percentage earned based on metric over the performance period 0.00%    
Total shareholder return metric [Member] | Maximum [Member] | Plan 8 [Member] | Performance-based restriced shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award percentage earned based on metric over the performance period 200.00%    
EPS CAGR and cash generation metric [Member] | Plan 3 [Member] | Performance-based restriced shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award percentage attained     50.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 35,850