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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating Activities:      
Net income $ 35,227 $ 76,598 $ 95,393
Adjustments to reconcile net income to cash provided by operating activities:      
Depreciation and amortization 44,972 37,764 31,029
Deferred income taxes 5,135 (8,843) (711)
Gain on CRS settlement     (9,949)
Revaluation of derivatives     (490)
Stock compensation 12,507 9,186 6,018
Loss on sale of property and equipment 1,042 468 20
Loss from write-off of intangible assets     358
Provision for doubtful accounts (469) 108 (120)
Defined benefit pension plan (income) expense (23) 184 668
Changes in operating assets and liabilities:      
Accounts receivable 6,033 (17,971) (12,399)
Inventory (4,348) (5,933) (10,954)
Prepaid expenses and other assets (12,334) 9,106 (11,122)
Accounts payable (7,691) 4,419 8,049
Accrued liabilities (30,171) 3,314 8,922
Net cash provided by operating activities 49,880 108,400 104,712
Investing Activities:      
Settlement of derivative financial instruments     (7,593)
Investment in subsidiary, net of cash acquired (66,994) (73,593) 107
Investment in development-stage entity   (4,486)  
Purchases of property and equipment (50,785) (66,316) (55,490)
Proceeds from the sale of property and equipment 91 57 248
Net cash used in investing activities (117,688) (144,338) (62,728)
Financing Activities:      
Cash paid for financing costs   (649)  
Borrowing of Debt   115,000 15,000
Repayments of Debt (27,156) (42,244) (5,053)
Cash paid for the cancellation of restricted stock (1,837) (1,196) (1,475)
Cash paid for the repurchase of common stock (5,326)    
Excess tax benefit from equity awards   7,509 6,681
Proceeds from the exercise of Common Stock options 2,755 1,438 9,273
Net cash (used in) provided by financing activities (31,564) 79,858 24,426
Foreign currency effect on cash and cash equivalents 25,357 (11,212) (7,631)
Net (decrease) increase in cash and cash equivalents (74,015) 32,708 58,779
Cash and cash equivalents at beginning of period 177,187 144,479 85,700
Cash and cash equivalents at end of period 103,172 177,187 144,479
Supplemental disclosure of cash flow information:      
Cash paid for interest 4,540 3,029 2,826
Cash paid for taxes 76,741 21,608 32,376
Supplemental disclosure of non-cash transactions:      
Common Stock issued to directors and employees $ 6,298 $ 4,589 $ 3,734