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Stock-Based Compensation (Narrative) (Details)
shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
shares
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
target
shares
Sep. 30, 2014
USD ($)
Apr. 30, 2012
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized for issuance | shares         11.6
Restricted stock units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     3 years    
Nonvested time-based shares [Member] | General and administrative expense [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation expense | $ $ 0.4 $ 0.4 $ 1.2 $ 1.4  
Nonvested performance-based shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     3 years    
Number of distinct components     3    
Number of sub-targets     5    
Number of sub-targets, market-based and equity classified     2    
Number of sub-targets, market-based and liability classified     1    
Number of sub-targets, performance-based and equity classified     2    
Nonvested performance-based shares [Member] | General and administrative expense [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation expense | $ $ 0.3 $ 0.2 $ 1.0 $ 0.8  
Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award expiration period     10 years    
2004 and 2012 Plans Combined [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares available and reserved for grant | shares 4.4   4.4    
2012 Equity Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized for issuance | shares         5.0
2004 Equity Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized for issuance | shares         5.2
General Employee Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized for issuance | shares         1.4