Pensions and Other Postretirement Benefit Plans (Schedule of Pension Plans with Projected Benefit Obligation and Accumulated Benefit Obligation in Excess of Plan Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Plans with projected benefit obligation in excess of plan assets:
Projected benefit obligation	$ 120,312	$ 126,029
Accumulated benefit obligation	117,447	122,855
Fair value of plan assets	81,421	86,021
Plans with accumulated benefit obligation in excess of plan assets:
Projected benefit obligation	120,312	126,029
Accumulated benefit obligation	117,447	122,855
Fair value of plan assets	$ 81,421	$ 86,021