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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Cash flows from operating activities [Abstract]    
Net income $ 99,342 $ 177,851
Adjustments to reconcile net income to cash provided by operating activities    
Depreciation and amortization 80,743 66,342
Stock-based compensation expense 24,606 29,450
ESPP expense 147 0
Amortization of deferred financing costs 123 235
Deferred tax provision 13,823 1,966
Provision for (recovery of) bad debts (122) (113)
(Gain) loss on sale of assets (521) 193
Changes in fair value of marketable securities 1,736 (723)
Change in value of contingent consideration (1,532) 0
Other (3,909) 0
Changes in operating assets and liabilities    
Accounts receivable 62,711 (5,779)
Inventories 37,576 (37,890)
Other current assets 11,801 (71)
Other assets 2,479 2,215
Accounts payable 1,162 2,907
Deferred revenue (17,672) 14,615
Accrued and other current liabilities (17,991) 18,671
Other non-current liabilities 885 4,058
Net cash provided by operating activities 295,387 273,927
Cash flows from investing activities    
Acquisition of Timco Services, Inc. (net of acquired cash) (78,676) 0
Purchases of property, plant and equipment (88,296) (124,187)
Proceeds from sale of assets and equipment 3,100 653
Purchase of marketable securities (94) (1,539)
Net cash used in investing activities (163,966) (125,073)
Cash flows from financing activities    
Repayments of borrowings (57) (54)
Dividends paid on common stock (69,573) (46,170)
Dividends paid on preferred stock (2) (1)
Distribution to noncontrolling interest (43,539) (32,470)
Treasury shares withheld (4,359) (4,154)
Proceeds from the issuance of ESPP shares 290 0
Net cash used in financing activities (117,240) (82,849)
Effect of exchange rate changes on cash 3,518 (2,564)
Net increase in cash 17,699 63,441
Cash and cash equivalents at beginning of period 489,354 404,947
Cash and cash equivalents at end of period $ 507,053 $ 468,388