Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	12 Months Ended
	Jan. 14, 2016	Feb. 05, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Stockholders' Equity Note [Abstract]
Dividends paid per share (in dollars per share)			$ 1.12	$ 1.00	$ 0.80
Options vesting and exercisable period, maximum			8 years
Total intrinsic value of stock options exercised			$ 14,174	$ 7,466	$ 9,925
Total unrecognized stock-based compensation expense			$ 15,073
Weighted average period over which total unrecognized stock-based compensation expense will be recognized			4 years 7 months 6 days
Total grant date fair value of stock options vesting			$ 5,143	7,287	3,508
Total stock-based compensation expense			$ 5,841	$ 7,039	$ 5,400
Options termination period			9 years
Subsequent Event [Member]
Subsequent Event [Line Items]
Dividend declared per share (in dollars per share)	$ 0.30
Purchases of common stock (in shares)		1,600,000
Weighted Average [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Price of common stock purchased (in dollars per share)		$ 37.15