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Stock Compensation Plans - Narrative (Details)	1 Months Ended	12 Months Ended
Stock Compensation Plans - Narrative (Details)	May 31, 2018 shares	Dec. 31, 2019 USD ($) plan installment $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	May 31, 2014 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of compensation plans \| plan		2
Total intrinsic value of stock options exercised \| $		$ 3,400,000	$ 7,500,000	$ 1,200,000
Fair value of stock options vested \| $		5,100,000	3,700,000	4,100,000
Allocated share-based compensation expense \| $		11,100,000	$ 7,600,000	$ 6,500,000
Unrecognized stock-based compensation expense \| $		$ 11,700,000
Weighted average, expected recognition period		2 years
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding		486,682	792,943
Granted (in shares)		0
Employee Stock Option \| Black-Scholes Option Valuation Model
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option weighted average grant date fair value (in dollars per share) \| $ / shares			$ 23.43	$ 14.51
Restricted Time Based Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of installments \| installment		3
Restricted Performance Based Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, years		3 years
Number of performance based shares granted (in shares)			0	0
Restricted Performance Based Stock Units \| Black-Scholes Option Valuation Model
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in dollars per share) \| $ / shares		$ 66.16
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, years		3 years
Granted (in dollars per share) \| $ / shares		$ 50.83
Number of performance based shares granted (in shares)		284,445
2009 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock authorized for grant awards		1,781,546
Options outstanding		74,386
Exercise price, lower range (usd per share) \| $ / shares		$ 43.33
Exercise price, upper range (usd per share) \| $ / shares		$ 57.54
Expiration period, years		7 years
2014 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock authorized for grant awards	2,974,543				1,974,543
Expiration period, years		7 years
Number of additional shares authorized	1,000,000
2014 Plan \| Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding		412,343
Exercise price, lower range (usd per share) \| $ / shares		$ 33.05
Exercise price, upper range (usd per share) \| $ / shares		$ 61.30
Vesting period, years		3 years
2004 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock authorized for grant awards	891,960
Director's Plan, Per Director \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of shares granted upon election \| $		$ 100,000
Restricted shares granted based on percent of director compensation		50.00%
Director's Plan, Per Director \| Restricted Stock \| Board of Directors Chairman
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Shares Granted Annually \| $		$ 50,000
Director's Plan, Per Director \| Restricted Stock \| Lead Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Shares Granted Annually \| $		$ 40,000