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Performance Share Status (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 2,088    
Long-Term Compensation Plan - 2014 [Member] | Non-Market-Based Performance Condition One      
Summary of award information associated with market and non-market-based performance condition awards      
Grant Date Fair Value $ 14.35    
Estimated Number of Performance Shares to be Issued 0    
Maximum Number of Performance Shares that could Potentially be Issued 69    
Long-Term Compensation Plan - 2014 [Member] | Market Based Performance Share Units [Member]      
Summary of award information associated with market and non-market-based performance condition awards      
Grant Date Fair Value $ 20.16 $ 20.16  
Estimated Number of Performance Shares to be Issued 0    
Maximum Number of Performance Shares that could Potentially be Issued 69    
Long-Term Compensation Plan - 2013 [Member] | Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
PSU Target Goal Performance Period 3 years    
Long-Term Compensation Plan - 2013 [Member] | Non-Market-Based Performance Condition One      
Summary of award information associated with market and non-market-based performance condition awards      
Grant Date Fair Value $ 16.29    
Estimated Number of Performance Shares to be Issued 0    
Maximum Number of Performance Shares that could Potentially be Issued 46    
Long-Term Compensation Plan - 2013 [Member] | Market Based Performance Share Units [Member]      
Summary of award information associated with market and non-market-based performance condition awards      
Grant Date Fair Value $ 24.74   $ 24.74
Estimated Number of Performance Shares to be Issued 0    
Maximum Number of Performance Shares that could Potentially be Issued 46    
Long-Term Compensation Plans 2014 and 2013 | Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 219