Miscellaneous Income, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Other Income and Expenses [Abstract]
Rabbi trust investment income	$ 119	$ 1,077	$ 1,186	$ 1,577
Insurance proceeds	0	756	314	756
Foreign currency translation	137	23	266	(383)
Gain on sales of operating property and equipment	27	1,286	81	2,590
Contract settlement	41	0	56	2,908
Other, net	704	1,686	1,762	2,762
Total	$ 1,028	$ 4,828	$ 3,665	$ 10,210