Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended					9 Months Ended	53 Months Ended
	Mar. 28, 2017	Aug. 31, 2017	Feb. 28, 2017	Jan. 31, 2017	Aug. 31, 2016	Feb. 29, 2016	Sep. 30, 2017	Sep. 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		11,448	11,784		11,745	10,450
Equity Plan | Restricted Stock Units
Common Stock
Units granted							259,065	259,065
Accrued dividend equivalent units							2,707	2,707