Business Segment and Geographic Information (Reconciliation to Consolidated Statements of Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting [Abstract]
Operating income	$ 76,255	$ 81,241	$ 50,117
Equity income in unconsolidated joint ventures	2,890	4,123	4,326
Other income (expense), net	(8,492)	(1,194)	(1,240)
Interest income (expense), net	(4,480)	(2,946)	(3,481)
Income before income taxes	$ 66,173	$ 81,224	$ 49,722