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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash flows from operating activities [Abstract]    
Net income $ 75,254 $ 110,411
Adjustments to reconcile net income to cash provided by operating activities    
Depreciation and amortization 51,711 43,088
Stock-based compensation expense 18,571 20,236
ESPP expense 86 0
Amortization of deferred financing costs 82 172
Deferred tax provision 9,727 3,021
Provision for (recovery of) bad debts 335 (222)
(Gain) loss on sale of assets 871 (87)
Changes in fair value of marketable securities (404) (1,305)
Other (3,909) 0
Changes in operating assets and liabilities    
Accounts receivable 66,188 4,371
Inventories 17,499 (40,178)
Other current assets 8,669 1,826
Other assets 2,148 1,556
Accounts payable 1,778 411
Deferred revenue (18,574) 7,307
Accrued and other current liabilities (16,854) 8,432
Other non-current liabilities 2,734 2,906
Net cash provided by operating activities 215,912 161,945
Cash flows from investing activities    
Acquisition of Timco Services, Inc. (net of acquired cash) (78,676) 0
Purchases of property, plant and equipment (70,843) (77,722)
Proceeds from sale of assets and equipment 214 2,489
Purchase of marketable securities 0 (1,539)
Net cash used in investing activities (149,305) (76,772)
Cash flows from financing activities    
Repayments of borrowings (37) (36)
Dividends paid on common stock (46,305) (23,029)
Dividends paid on preferred stock (2) (1)
Distribution to noncontrolling interest (32,479) (22,224)
Treasury shares withheld (533) 0
Net cash used in financing activities (79,356) (45,290)
Effect of exchange rate changes on cash (1,860) (1,154)
Net increase (decrease) in cash (14,609) 38,729
Cash and cash equivalents at beginning of period 489,354 404,947
Cash and cash equivalents at end of period $ 474,745 $ 443,676