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Share-Based Compensation (Narrative) (Details)
$ in Millions
9 Months Ended 12 Months Ended
Mar. 05, 2014
$ / shares
shares
Jan. 28, 2014
$ / shares
Jan. 06, 2014
$ / shares
Dec. 02, 2013
$ / shares
shares
Aug. 08, 2013
$ / shares
Oct. 04, 2015
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2013
shares
Dec. 31, 2011
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Outstanding             206,685        
Shares available for grant             1,039,568        
Estimated weighted-average fair value of stock options granted | $ / shares             $ 11.91 $ 17.88 $ 26.32    
Compensation expense | $             $ 5.5 $ 6.5 $ 7.1    
Unrecognized compensation costs | $             $ 6.8 $ 10.3 $ 7.0    
Weighted average period of recognition of compensation expense (in years)             1 year 9 months 22 days        
Chief Executive Officer [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Unrecognized compensation costs | $             $ 5.0        
2014 Plan [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share based compensation shares authorized             1,700,000        
Share-based Compensation Arrangement by Share-based Payment Award, Other than Options, Number of Shares per Share Counted Towards Aggregate Limit           1.9          
Stock-Options [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share based compensation shares authorized           200,000          
Stock options outstanding             736,319 570,737 486,004   355,081
Options granted             210,633 118,992 164,503    
Exercised, Weighted Average Exercise Price | $ / shares           $ 41.17 $ 41.05 $ 33.44 $ 32.41    
Vesting period, (in years)           60 days          
Options Exercisable, Options             226,386 140,248 78,226    
Fair Value Assumptions, Maximum Term             10 years        
Award Forfeit Period           5 years 5 years        
Unrecognized compensation costs | $             $ 2.8        
Weighted average period of recognition of compensation expense (in years)             1 year 8 months 12 days        
Weighted average contractual term for stock-options outstanding             6 years 27 days        
Weighted average contractual term for stock-options exercisable, years             5 years 5 months 17 days        
Aggregate intrinsic value of stock-options exercised | $             $ 0.1 $ 0.1 $ 0.6    
Aggregate fair value of stock-options vested | $             1.7 $ 1.2 $ 0.9    
Aggregate intrinsic value of stock-options outstanding | $             11.5        
Aggregate intrinsic value of stock-options exercisable | $             $ 4.6        
Stock-Options [Member] | Chief Financial Officer [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Options granted       100,000              
Exercised, Weighted Average Exercise Price | $ / shares       $ 79.33              
Stock-Options [Member] | Chief Executive Officer [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Options granted 100,000                    
Exercised, Weighted Average Exercise Price | $ / shares $ 70.42                    
Shares Authorized for Issuance           150,000          
Stock-Options [Member] | Range 1 [Member] | Chief Financial Officer [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock Price Target | $ / shares             $ 87.50        
Shares Authorized for Issuance             25,000        
Stock-Options [Member] | Range 1 [Member] | Chief Executive Officer [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock Price Target | $ / shares         $ 50.00   $ 50.00        
Shares Authorized for Issuance             50,000        
Stock-Options [Member] | Range 2 [Member] | Chief Financial Officer [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock Price Target | $ / shares             $ 100.00        
Shares Authorized for Issuance             50,000        
Stock-Options [Member] | Range 2 [Member] | Chief Executive Officer [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock Price Target | $ / shares     $ 60.00       $ 60.00        
Shares Authorized for Issuance             100,000        
Stock-Options [Member] | Range 3 [Member] | Chief Financial Officer [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock Price Target | $ / shares             $ 112.50        
Shares Authorized for Issuance             75,000        
Stock-Options [Member] | Range 3 [Member] | Chief Executive Officer [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock Price Target | $ / shares   $ 70.00         $ 70.00        
Shares Authorized for Issuance             150,000        
Stock-Options [Member] | Vesting Year 1 [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Award vesting percentage           25.00%          
Stock-Options [Member] | Vesting Year 2 [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Award vesting percentage           50.00%          
Stock-Options [Member] | Vesting Year 3 [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Award vesting percentage           100.00%          
Restricted Stock Units with Special Rights [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Outstanding             3,040        
Restricted Stock Units (RSUs) [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Outstanding             138,761 109,281 115,949 176,084  
Restricted stock units granted             98,942 62,322 38,899    
Granted, Weighted Average Price | $ / shares             $ 41.09 $ 51.53 $ 72.11    
Unrecognized compensation costs | $             $ 3.6        
Aggregate intrinsic value of RSU Awards / RSU MSPs | $             2.5 $ 3.0 $ 4.2    
Aggregate fair value of RSU Awards vested | $             2.7 $ 2.4 $ 2.7    
Aggregate intrinsic value of RSU Awards outstanding | $             9.0        
Aggregate intrinsic value of RSU awards exercisable | $             $ 0.2        
Restricted Stock Units (RSUs) [Member] | Minimum [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Performance Target Threshold             0.00%        
Restricted Stock Units (RSUs) [Member] | Maximum [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Performance Target Threshold             200.00%        
Performance Shares [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted stock units granted             51,026 26,094      
Restricted Stock Units Management Stock Purchase Plan [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Outstanding             67,924 78,732 69,293 62,896  
Vesting period, (in years)             3 years        
Restricted stock units granted             20,130 38,965 32,752    
Granted, Weighted Average Price | $ / shares             $ 26.06 $ 34.73 $ 47.95    
Discount rate granted for RSU MSPs             33.00%        
Amortization period of discount             four        
Restricted stock units discount amount | $ / shares             12.83 17.11      
Unrecognized compensation costs | $             $ 0.4        
Aggregate intrinsic value of RSU Awards / RSU MSPs | $             0.4 $ 0.5 $ 1.1    
Aggregate fair value of RSU Awards vested | $             0.4 $ 0.3 0.3    
Aggregate intrinsic value of RSU Awards outstanding | $             $ 1.9        
Phantom Share Units (PSUs) [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Outstanding             33,320 28,660      
Cash Used to Settle Awards | $             $ 0.5        
Compensation Liability | $             1.0 $ 0.7      
Phantom Share Units (PSUs) [Member] | Selling, General and Administrative Expenses [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Compensation expense | $             $ 0.9 $ 0.2 $ 0.3    
$38.89 - $74.65 | Restricted Stock Units (RSUs) [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Outstanding             138,761        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms             1 year 7 months 16 days        
$38.89 - $74.65 | Restricted Stock Units Management Stock Purchase Plan [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms             1 year 1 month 6 days