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Stock Plans - Option Exercise Ranges and FV Assumptions (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Options Outstanding      
Shares 2,064    
Aggregate Intrinsic Value $ 1,671    
Weighted-Average Remaining Contractual Life 5 years 7 months 6 days    
Weighted-Average Exercise Price (in dollars per share) $ 32.91    
Options Exercisable      
Shares 1,609    
Aggregate Intrinsic Value $ 1,671    
Weighted Average Remaining Contractual life 5 years 3 months 18 days    
Weighted-Average Exercise Price (in dollars per share) $ 32.95    
Assumptions used to estimate fair value of options granted      
Cash received from options exercised $ 2,233 $ 12,056 $ 2,199
Intrinsic value of options exercised $ 2,089 $ 8,390 $ 2,509
$8.82 - $20.80      
Information about stock options outstanding      
Exercise price, low end of range (in dollars per share) $ 8.82    
Exercise price, high end of range (in dollars per share) $ 20.80    
Options Outstanding      
Shares 199    
Aggregate Intrinsic Value $ 1,671    
Weighted-Average Remaining Contractual Life 6 months    
Weighted-Average Exercise Price (in dollars per share) $ 12.15    
Options Exercisable      
Shares 199    
Aggregate Intrinsic Value $ 1,671    
Weighted Average Remaining Contractual life 6 months    
Weighted-Average Exercise Price (in dollars per share) $ 12.15    
$24.40 - $36.97      
Information about stock options outstanding      
Exercise price, low end of range (in dollars per share) 24.40    
Exercise price, high end of range (in dollars per share) $ 36.97    
Options Outstanding      
Shares 1,497    
Weighted-Average Remaining Contractual Life 6 years 2 months 12 days    
Weighted-Average Exercise Price (in dollars per share) $ 32.55    
Options Exercisable      
Shares 1,088    
Weighted Average Remaining Contractual life 6 years 1 month 6 days    
Weighted-Average Exercise Price (in dollars per share) $ 32.69    
$37.22 - $51.70      
Information about stock options outstanding      
Exercise price, low end of range (in dollars per share) 37.22    
Exercise price, high end of range (in dollars per share) $ 51.70    
Options Outstanding      
Shares 368    
Weighted-Average Remaining Contractual Life 5 years 10 months 24 days    
Weighted-Average Exercise Price (in dollars per share) $ 45.57    
Options Exercisable      
Shares 322    
Weighted Average Remaining Contractual life 5 years 8 months 12 days    
Weighted-Average Exercise Price (in dollars per share) $ 46.65    
Stock Options      
Assumptions used to estimate fair value of options granted      
Weighted average fair value $ 10.58 $ 11.58 $ 13.47
Dividend yield 0.00% 0.00% 0.00%
Expected volatility factor 44.00% 44.00% 49.00%
Risk-free interest rate 1.18% 1.19% 1.27%
Expected life (in years) 3 years 10 months 24 days 3 years 10 months 24 days 4 years 6 months