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Equity Compensation Plans (Activity Under Stock Based Compensation Plans) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Jan. 31, 2014
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Beginning balance, Number of Shares Outstanding, Stock Options   2,454 2,734  
Granted, Number of Shares Outstanding, Stock Options   65 215  
Exercised, Number of Shares Outstanding, Stock Options   (458) (101)  
Cancelled or forfeited, Number of Shares Outstanding, Stock Options   (35) (394)  
Ending balance, Number of Shares Outstanding, Stock Options   2,026 2,454 2,734
Vested and expected to vest, Number of Shares Outstanding, Stock Options   2,004 2,420  
Exercisable, Ending balance, Number of Shares Outstanding, Stock Options   1,766 1,914  
Beginning balance, Weighted Average Exercise Price, Stock Options   $ 12.51 $ 11.75  
Granted, Weighted Average Exercise Price, Stock Options   20.22 16.74  
Exercised, Weighted Average Exercise Price, Stock Options   9.61 16.66  
Cancelled or forfeited, Weighted Average Exercise Price, Stock Options   19.08 8.47  
Ending balance, Weighted Average Exercise Price, Stock Options   13.30 12.51 $ 11.75
Vested and expected to vest, Weighted Average Exercise Price, Stock Options   13.23 12.42  
Exercisable, Ending balance, Weighted Average Exercise Price, Stock Options   $ 12.48 $ 11.01  
Outstanding, Ending balance, Weighted Average Remaining Contractual Term, Stock Options   5 years 7 months 13 days 6 years 7 days  
Vested and expected to vest, Weighted Average Remaining Contractual Term, Stock Options   5 years 6 months 29 days 5 years 11 months 27 days  
Exercisable, Ending balance, Weighted Average Remaining Contractual Term, Stock Options   5 years 2 months 12 days 5 years 4 months 24 days  
Outstanding, Ending balance, Aggregate Intrinsic Value, Stock Options   $ 11,730 $ 18,295  
Vested and expected to vest, Aggregate Intrinsic Value, Stock Options   11,717 18,228  
Exercisable, Ending balance, Aggregate Intrinsic Value, Stock Options   $ 11,471 $ 16,897  
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Beginning balance, Number of Shares Outstanding   1,416 1,071  
Awarded, Number of Shares Outstanding   771 710  
Released, Number of Shares Outstanding   (331) (295)  
Forfeited, Number of Shares Outstanding   (11) (70)  
Ending balance, Number of Shares Outstanding   1,845 1,416 1,071
Beginning balance, Weighted Average Grant Date Fair Value   $ 17.40 $ 17.30  
Awarded, Weighted Average Grant Date Fair Value   19.38 16.35 $ 17.82
Released, Weighted Average Grant Date Fair Value   17.43 14.49  
Forfeited, Weighted Average Grant Date Fair Value   18.52 17.31  
Ending balance, Weighted Average Grant Date Fair Value   $ 18.22 $ 17.40 $ 17.30
Performance Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Beginning balance, Number of Shares Outstanding, Stock Options   450 450  
Granted, Number of Shares Outstanding, Stock Options    
Exercised, Number of Shares Outstanding, Stock Options    
Cancelled or forfeited, Number of Shares Outstanding, Stock Options    
Ending balance, Number of Shares Outstanding, Stock Options   450 450 450
Exercisable, Ending balance, Number of Shares Outstanding, Stock Options   250 250  
Awarded, Number of Shares Outstanding 450      
Beginning balance, Weighted Average Exercise Price, Stock Options   $ 13.48 $ 13.48  
Granted, Weighted Average Exercise Price, Stock Options    
Exercised, Weighted Average Exercise Price, Stock Options    
Cancelled or forfeited, Weighted Average Exercise Price, Stock Options    
Ending balance, Weighted Average Exercise Price, Stock Options   13.48 13.48 $ 13.48
Exercisable, Ending balance, Weighted Average Exercise Price, Stock Options   $ 13.48 $ 13.48  
Outstanding, Ending balance, Weighted Average Remaining Contractual Term, Stock Options   5 years 5 months 12 days 6 years 5 months 12 days  
Exercisable, Ending balance, Weighted Average Remaining Contractual Term, Stock Options   5 years 5 months 12 days 6 years 5 months 12 days  
Outstanding, Ending balance, Aggregate Intrinsic Value, Stock Options   $ 2,774 $ 3,074  
Exercisable, Ending balance, Aggregate Intrinsic Value, Stock Options   $ 1,541 $ 1,708