Stockholders' Equity (Details Textual) - USD ($) $ in Thousands		12 Months Ended
	Dec. 31, 2016	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013	Nov. 06, 2012
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program Expiration Date	Dec. 31, 2016
Preferred stock shares authorized		5,000,000.0	5,000,000.0
Preferred stock shares issued		0	0
Preferred stock shares outstanding		0	0
Purchase of common stock on stock buyback program					2,653,399
Payments for Repurchase of Common Stock		$ (5,000)	$ 0	$ 0
Stock Repurchased During Period, Shares		283,772
Annual maximum purchases authorized under stock buyback program		$ 25,000
Common stock shares withheld		105,058	80,096
Treasury stock, shares		1,447,394	1,453,770