Segment Information - Reconciliation of Operating Profit (Loss) from Segments to Consolidated (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Reconciliation of income from continuing operations from segments to consolidated [Abstract]
Total consolidated operating income (loss)	$ 9,475	$ (3,929)	$ 28,400	$ 10,337
Interest expense	(9,823)	(8,845)	(28,312)	(16,369)
Non-operating income, net	1,205	1,527	3,877	3,147
Income (loss) before income taxes	$ 857	$ (11,247)	$ 3,965	$ (2,885)