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, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Plans with projected benefit obligation in excess of plan assets:
Projected benefit obligation	$ 126,029	$ 123,749
Accumulated benefit obligation	122,855	120,287
Fair value of plan assets	86,021	80,447
Plans with accumulated benefit obligation in excess of plan assets:
Projected benefit obligation	126,029	123,749
Accumulated benefit obligation	122,855	120,287
Fair value of plan assets	$ 86,021	$ 80,447