Investment in Unconsolidated Affiliates Investments in Unconsolidated Affiliates - Combined Financial Information of Unconsolidated Affiliated Companies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Assets:
Current assets	$ 67,559	$ 56,709
Noncurrent assets	119,240	127,657
Total assets	186,799	184,366
Liabilities:
Current liabilities	42,765	50,756
Noncurrent liabilities	57,539	66,429
Total liabilities	100,304	117,185
Results of operations:
Revenue	164,888	157,722	$ 162,432
Operating income (loss)	465	(14,915)	(1,715)
Income (loss) from continuing operations	19,104	(13,636)	(2,900)
Net income (loss)	$ 19,104	$ (13,636)	$ (2,900)