Pension Plan (Details) - Change in unrecognized pension costs recorded in other comprehensive loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Change in unrecognized pension costs recorded in other comprehensive loss [Abstract]
Balance at beginning of year	$ 7,449	$ 4,886
Net actuarial (gain) loss	(73)	2,921
Recognized loss	(579)	(358)
Balance at end of year	$ 6,797	$ 7,449