Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended			6 Months Ended	38 Months Ended	50 Months Ended
	Mar. 28, 2017	Feb. 28, 2017	Jan. 31, 2017	Feb. 29, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017
Share repurchase plan
Aggregate purchase price up to which shares can be acquired under share repurchase program		$ 5.0
Number of shares purchased and cancelled under the share repurchase program	216,350
Amount paid for shares purchased and cancelled under share repurchase program	$ 5.0
Amount paid for shares purchased and cancelled under share repurchase program (per share)	$ 23.10
LTR Plan
Common Stock
Amount received in exchange for shares of common stock under a long term incentive plan		$ 1.1		$ 1.4
Shares of common stock issued under the long-term incentive plan		65,429		85,907
Percentage of average market closing prices used in determining number of common stock that could be purchased by participants			75.00%
Equity Plan
Common Stock
Shares of common stock issued as a part of quarterly compensation of non-employee members of the Board of Directors		11,784		10,450
Equity Plan | Restricted Stock Units
Common Stock
Units granted					259,065	259,065	259,065
Accrued dividend equivalent units					2,378		2,378