Employee Benefit Plans - Stock Option Activity (Details) - Stock Option Awards $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) $ / shares shares
Number of Shares
Options Outstanding, Beginning Balance | shares	358
Exercised | shares	(51)
Options Outstanding, Ending Balance | shares	307
Vested and Exercisable at December 31, 2016 | shares	307
Weighted Average Exercise Price
Options Outstanding, Beginning Balance (in dollars per share) | $ / shares	$ 21.12
Exercised (in dollars per share) | $ / shares	23.57
Options Outstanding, Ending Balance (in dollars per share) | $ / shares	20.72
Vested and Exercisable at December 31, 2016 (in dollars per share) | $ / shares	$ 20.72
Additional Information:
Weighted average remaining contractual life, options outstanding at end of year	4 years 6 months
Weighted average remaining contractual life, vested and exercisable at December 31, 2016	4 years 6 months
Aggregate intrinsic value, options outstanding at end of year | $	$ 12,443
Aggregate intrinsic value, vested and exercisable at December 31, 2016 | $	$ 12,443