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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Cash flows from operating activities:    
Net cash provided by operating activities $ 38,396 $ 26,539
Cash flows from investing activities:    
Capital expenditures for property, plant and equipment (12,934) (20,980)
Capital expenditures for intangible assets (1,327) (219)
Purchases of assets and investments (3,613)  
Purchase of debt securities   (15,250)
Net proceeds from sale of assets   4,800
Net cash used in investing activities (17,874) (31,649)
Cash flows from financing activities:    
Proceeds from issuance of common shares 19,688 3,106
Tax payments for shares withheld to satisfy withholding obligations (2,354) (1,437)
Payment of debt issuance costs   (1,723)
Changes in restricted cash   34,424
Repurchase and retirement of common shares (54,996)  
Net cash (used in) provided by financing activities (37,662) 34,370
Effect of exchange rate changes on cash 301 (2,381)
Net (decrease) increase in cash and cash equivalents (16,839) 26,879
Cash and cash equivalents at the beginning of the period 63,663 36,815
Cash and cash equivalents at the end of the period $ 46,824 $ 63,694