Employee Pension Plans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Summary of net periodic benefit cost
Interest cost	$ 1,053	$ 1,011
Expected return on plan assets	(1,203)	(1,256)
Amortization of net loss	427	1,460
Other	150
Net periodic benefit cost	427	1,215
Company contribution	300	$ 900
Expected contributions remainder of current fiscal year	$ 1,500