Dividends and Share Repurchases (Details) - USD ($) $ / shares in Units, $ in Thousands				3 Months Ended			9 Months Ended		10 Months Ended
	Sep. 16, 2016	Jun. 17, 2016	Mar. 18, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Dec. 31, 2015
Dividends and Share Repurchases
Cash dividends paid	$ 700	$ 700	$ 700				$ 2,087	$ 2,099
Cash dividend (in dollars per share)	$ 0.125	$ 0.125	$ 0.125
Dividends payable date of record	Aug. 16, 2016	May 27, 2016	Feb. 26, 2016
Share repurchase program amount authorized										$ 10,000
Shares repurchased (in shares)				0	0	50,068
Weighted average price per share (in dollars per share)						$ 53.52
Shares paid for tax withholding for share-based compensation									53,154
Weighted average per share prices for shares used to pay tax withholding liability (in dollars per share)									$ 53.59