Stock-Based Compensation - Schedule of Stock Option Activity and Weighted Average Exercise Prices (Details) - Employee Stock Option $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($) $ / shares shares
Options
Outstanding at January 1, 2019 (in shares) | shares	792,943
Granted (in shares) | shares	0
Forfeited or expired (in shares) | shares	(69,670)
Exercised (in shares) | shares	(21,118)
Outstanding at June 30, 2019 (in shares) | shares	702,155
Options exercisable at June 30, 2019 (in shares) | shares	612,544
Weighted- Average Exercise Price
Outstanding at January 1, 2019 (in dollars per share) | $ / shares	$ 47.59
Granted (in dollars per share) | $ / shares	0
Forfeited or expired (in dollars per share) | $ / shares	54.47
Exercised (in dollars per share) | $ / shares	34.76
Outstanding at June 30, 2019 (in dollars per share) | $ / shares	47.54
Options exercisable at June 30, 2019 (in dollars per share) | $ / shares	$ 47.28
Weighted-Average Remaining Contractual Term (Years)
Weighted-average remaining contractual term, outstanding at June 30, 2019	4 years
Weighted-average remaining contractual term, options exercisable at June 30, 2019	2 years 8 months 12 days
Aggregate Intrinsic Value as of June 30, 2019
Aggregate intrinsic value outstanding at June 30, 2019 | $	$ 6,116
Aggregate intrinsic value of options exercisable at June 30, 2019 | $	$ 5,396