Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net cash provided by operating activities	$ 26,236	$ 35,966
Cash flows from investing activities:
Capital expenditures for property, plant and equipment	(20,980)	(11,324)
Capital expenditures for intangible assets	(219)	(170)
Net proceeds from sale of assets	4,800
Purchase of other investments		(1,457)
Purchase of debt securities	(15,250)
Net proceeds from sale of other investments		32
Net cash used in investing activities	(31,649)	(12,919)
Cash flows from financing activities:
Net proceeds from issuance of common shares	1,669	10,333
Repayment of long term debt, net		(20,000)
Payment of debt issuance costs	(1,723)
Changes in restricted cash	34,424	(11,023)
Excess income tax benefit on employee stock-based awards	303	202
Net cash provided by (used in) financing activities	34,673	(20,488)
Effect of exchange rate changes on cash	(2,381)	(1,658)
Net increase in cash and cash equivalents	26,879	901
Cash and cash equivalents at the beginning of the period	36,815	28,924
Cash and cash equivalents at the end of the period	$ 63,694	$ 29,825