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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows from operating activities    
Net income (loss) $ (2,408) $ 46,401
Adjustments to reconcile net income (loss) to cash provided by operating activities    
Depreciation and amortization 29,450 24,001
Stock-based compensation expense 4,104 8,010
ESPP expense 104 55
Amortization of deferred financing costs 41 41
Deferred tax provision (3,303) 5,780
Provision for (recovery of) bad debts 381 46
(Gain) loss on sale of assets (770) 184
Changes in fair value of marketable securities 94 (721)
Unrealized loss on derivative 974 0
Changes in operating assets and liabilities    
Accounts receivable 33,005 13,685
Inventories 828 (6,276)
Other current assets 189 6,758
Other assets (13) 2,065
Accounts payable (2,862) 2,077
Deferred revenue (5,156) (5,861)
Accrued and other current liabilities (6,466) 1,831
Other non-current liabilities (2,029) 2,053
Net cash provided by operating activities 46,163 100,129
Cash flows from investing activities    
Purchases of property, plant and equipment (8,268) (43,871)
Proceeds from sale of assets and equipment 1,181 90
Purchase of marketable securities (736) 0
Premiums on life insurance policies 0 (14)
Net cash used in investing activities (7,823) (43,795)
Cash flows from financing activities    
Repayments of borrowings (2,782) (19)
Proceeds from borrowings 96 0
Dividends paid on common stock (23,300) (23,150)
Distribution to noncontrolling interest (5,012) (20,982)
Treasury shares withheld (584) (36)
Proceeds from the issuance of ESPP shares 388 0
Net cash used in financing activities (31,194) (44,187)
Effect of exchange rate changes on cash (707) (3,059)
Net increase in cash 6,439 9,088
Cash and cash equivalents at beginning of period 602,359 489,354
Cash and cash equivalents at end of period $ 608,798 $ 498,442