Stock-Based Compensation - Summary Stock Options Outstanding and Exercisable (Details)	12 Months Ended
	Dec. 31, 2016 $ / shares shares
Exercise Price $6.22 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower limit (in dollars per share)	$ 6.22
Exercise price range, upper limit (in dollars per share)	$ 6.22
Options Outstanding, Shares | shares	157,750
Options outstanding, Weighted Average Remaining Contractual Life	2 years 1 month 16 days
Exercise price range(in dollars per share)	$ 6.22
Options Exercisable, Shares | shares	157,750
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 6.22
Exercise Price Range From 11.59 Dollars and 11.59 Dollars [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower limit (in dollars per share)	11.59
Exercise price range, upper limit (in dollars per share)	$ 11.59
Options Outstanding, Shares | shares	28,080
Options outstanding, Weighted Average Remaining Contractual Life	3 years 1 month 17 days
Exercise price range(in dollars per share)	$ 11.59
Options Exercisable, Shares | shares	28,080
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 11.59
Exercise Price Range From 12.21 Dollars to 12.21 Dollars [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower limit (in dollars per share)	12.21
Exercise price range, upper limit (in dollars per share)	$ 12.21
Options Outstanding, Shares | shares	77,400
Options outstanding, Weighted Average Remaining Contractual Life	3 years 2 months 5 days
Exercise price range(in dollars per share)	$ 12.21
Options Exercisable, Shares | shares	77,400
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 12.21
Exercise Price Range From 19.6 Dollars to 28.11 Dollars [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower limit (in dollars per share)	19.60
Exercise price range, upper limit (in dollars per share)	$ 28.11
Options Outstanding, Shares | shares	59,660
Options outstanding, Weighted Average Remaining Contractual Life	4 years 9 months 11 days
Exercise price range(in dollars per share)	$ 24.23
Options Exercisable, Shares | shares	59,660
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 24.23
Exercise Price Range From 28.79 Dollars to 38.4 Dollars [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower limit (in dollars per share)	28.79
Exercise price range, upper limit (in dollars per share)	$ 38.4
Options Outstanding, Shares | shares	37,659
Options outstanding, Weighted Average Remaining Contractual Life	6 years 18 days
Exercise price range(in dollars per share)	$ 37.44
Options Exercisable, Shares | shares	27,197
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 37.08
Exercise Price Range From 47.50 Dollars to 47.50 Dollars [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower limit (in dollars per share)	47.5
Exercise price range, upper limit (in dollars per share)	$ 47.5
Options Outstanding, Shares | shares	24,650
Options outstanding, Weighted Average Remaining Contractual Life	7 years 1 month 21 days
Exercise price range(in dollars per share)	$ 47.50
Options Exercisable, Shares | shares	12,328
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 47.50
Exercise Price Range From 65.36 Dollars to 65.36 Dollars [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower limit (in dollars per share)	65.36
Exercise price range, upper limit (in dollars per share)	$ 65.36
Options Outstanding, Shares | shares	20,395
Options outstanding, Weighted Average Remaining Contractual Life	8 years 1 month 24 days
Exercise price range(in dollars per share)	$ 65.36
Options Exercisable, Shares | shares	5,100
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 65.36
Exercise Price Range From 65.45 Dollars to 65.45 Dollars [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower limit (in dollars per share)	65.45
Exercise price range, upper limit (in dollars per share)	$ 65.45
Options Outstanding, Shares | shares	19,180
Options outstanding, Weighted Average Remaining Contractual Life	8 years 1 month 21 days
Exercise price range(in dollars per share)	$ 65.45
Options Exercisable, Shares | shares	4,795
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 65.45
Exercise Price Range From 73.52 Dollars To 73.52 Dollars [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower limit (in dollars per share)	73.52
Exercise price range, upper limit (in dollars per share)	$ 73.52
Options Outstanding, Shares | shares	50,000
Options outstanding, Weighted Average Remaining Contractual Life	8 years 7 months 2 days
Exercise price range(in dollars per share)	$ 73.52
Options Exercisable, Shares | shares	12,500
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 73.52
Exercise Price Range From 85.99 Dollars to 85.99 Dollars [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower limit (in dollars per share)	85.99
Exercise price range, upper limit (in dollars per share)	$ 85.99
Options Outstanding, Shares | shares	35,800
Options outstanding, Weighted Average Remaining Contractual Life	9 years 1 month 24 days
Exercise price range(in dollars per share)	$ 85.99
Options Exercisable, Shares | shares	0
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 0.00
Exercise Price Range From 6.22 Dollars to 85.99 Dollars [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower limit (in dollars per share)	6.22
Exercise price range, upper limit (in dollars per share)	$ 85.99
Options Outstanding, Shares | shares	510,574
Options outstanding, Weighted Average Remaining Contractual Life	4 years 9 months 11 days
Exercise price range(in dollars per share)	$ 30.60
Options Exercisable, Shares | shares	384,810
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 17.82