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Equity Awards - Restricted Shares Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Mar. 31, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Restricted shares issued related to director fee deferrals       6,275      
Restricted Shares [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of Unvested Restricted Shares Granted       572,109      
Unrecognized unvested restricted shares-based compensation expense $ 10,400     $ 10,400      
Weighted-average period for recognition of the unrecognized unvested restricted shares-based compensation expense       2 years      
Restricted shares-based compensation expense $ 1,700   $ 2,300 $ 4,600 $ 6,500    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period       319,446      
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       209,825      
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       42,937      
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       1,760      
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       32,040      
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 192,348            
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 0.85%            
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      
EPS CAGR and ROIC metric [Member] | Plan 7 [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, Performance Period Complete             50.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award percentage attained 30.00%            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 35,096            
Total shareholder return metric [Member] | Plan 7 [Member] | Performance-based restriced shares [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of Unvested Restricted Shares Granted 86,924            
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 0.50%            
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate 38.80%            
Total shareholder return metric [Member] | Minimum [Member] | Plan 7 [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] | 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 7 [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%            
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           70.25%  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period   28,205          
EPS CAGR and cash generation metric [Member] | Plan 6 [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 14,331