Supplemental Disclosures to Consolidated Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Supplemental Cash Flow Elements [Abstract]
Interest paid (net of amounts capitalized)	$ 592	$ 420
Income taxes (refunded) paid	(55)	212
Changes in purchases of property and equipment accrued in accounts payable, net	$ (2,308)	$ (496)