Stock-Based Compensation - Summary of Performance Stock Options Activity (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares shares
Number of Shares
Number of Shares, Outstanding, Beginning Balance (in shares) | shares	65,766
Number of Shares, Exercised (in shares) | shares	(10,000)
Number of Shares, Outstanding, Ending Balance (in shares) | shares	55,766
Number of Shares, Exercisable, Ending Balance (in shares) | shares	55,766
Weighted Average Grant Date Fair Value
Weighted Average Exercise Price, Outstanding, Beginning Balance (in dollars per share) | $ / shares	$ 16.27
Weighted Average Exercise Price, Exercised (in dollars per share) | $ / shares	22.17
Weighted Average Exercise Price, Outstanding, Ending Balance (in dollars per share) | $ / shares	15.21
Weighted Average Exercise Price, Exercisable, Ending Balance (in dollars per share) | $ / shares	$ 15.21
Weighted Average Remaining Contractual Term (in years), Outstanding	1 year 1 month 16 days
Weighted Average Remaining Contractual Term (in years), Exercisable	1 year 1 month 16 days
Aggregate intrinsic value, Outstanding | $	$ 462
Aggregate intrinsic value, Exercisable | $	$ 462
Performance Stock Options
Number of Shares
Number of Shares, Outstanding, Beginning Balance (in shares) | shares	266,522
Number of Shares, Exercised (in shares) | shares	(16,648)
Number of Shares, Cancelled/forfeited (in shares) | shares	(33,292)
Number of Shares, Outstanding, Ending Balance (in shares) | shares	216,582
Number of Shares, Vested or Expected to Vest (in shares) | shares	211,807
Number of Shares, Exercisable, Ending Balance (in shares) | shares	72,198
Weighted Average Grant Date Fair Value
Weighted Average Exercise Price, Outstanding, Beginning Balance (in dollars per share) | $ / shares	$ 31.43
Weighted Average Exercise Price, Exercised (in dollars per share) | $ / shares	30.95
Weighted Average Exercise Price, Cancelled/forfeited (in dollars per share) | $ / shares	30.95
Weighted Average Exercise Price, Outstanding, Ending Balance (in dollars per share) | $ / shares	31.54
Weighted Average Exercise Price, Vested and Expected to Vest (in dollars per share) | $ / shares	31.55
Weighted Average Exercise Price, Exercisable, Ending Balance (in dollars per share) | $ / shares	$ 31.54
Weighted Average Remaining Contractual Term (in years), Outstanding	4 years 3 months 4 days
Weighted Average Remaining Contractual Term (in years), Vested or expected to vest	4 years 2 months 26 days
Weighted Average Remaining Contractual Term (in years), Exercisable	4 years 3 months 4 days
Aggregate intrinsic value, Outstanding | $	$ 0
Aggregate intrinsic value, Vested or expected to vest | $	0
Aggregate intrinsic value, Exercisable | $	$ 0