Retirement Plans Defined Benefit Plan Disclosures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]
Fair Value of Plan Assets	$ 0
Employer contribution	1,550	$ 1,367
Benefit payments	(1,550)	(1,367)
Fair Value of Plan Assets	0	0
Funded Status	(28,399)	(30,047)
Accrued liabilities	(1,524)	(1,507)
Other non-current liabilities	(26,875)	(28,540)
Net amount recognized	28,399		$ 30,047
Net actuarial loss	6,492	8,399
Prior service cost	(1)	$ (1)
Net amount recognized, before tax effect	$ 6,491		$ 8,398
Discount rate	4.40%	4.20%
Rate of compensation increase	3.00%	3.00%