Employee Benefit Plans (Amounts Not Yet Reflected in Net Periodic Benefit Cost and Included in Accumulated Other Comprehensive Loss) (Details) (Employee Pension Plans [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2011
Employee Pension Plans [Member]
Amounts not yet reflected in net periodic benefit cost and included in accumulated other comprehensive loss:
Net actuarial loss	$ (56,147)	$ (42,261)
Accumulated other comprehensive loss	(56,147)	(42,261)	59,300
Cumulative Company contributions in excess of net periodic benefit cost	21,180	19,700
Net amount recognized in Consolidated Balance Sheets	$ (34,967)	$ (22,561)