Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net cash provided by operating activities	$ 8,954	$ 17,874
Cash flows from investing activities:
Capital expenditures for property, plant and equipment	(13,493)	(6,138)
Capital expenditures for intangible assets	(83)	(119)
Net proceeds from sale of assets	4,800
Purchase of debt securities	(15,250)
Net proceeds from sale of other investments		32
Net cash used in investing activities	(24,026)	(6,225)
Cash flows from financing activities:
Net proceeds from issuance of common shares	1,646	9,520
Changes in restricted cash	34,424	(21,406)
Excess income tax benefit on employee stock-based awards	54	40
Net cash provided by (used in) financing activities	36,124	(11,846)
Effect of exchange rate changes on cash	(1,921)	192
Net increase (decrease) in cash and cash equivalents	19,131	(5)
Cash and cash equivalents at the beginning of the period	36,815	28,924
Cash and cash equivalents at the end of the period	$ 55,946	$ 28,919