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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash flows from operating activities      
Net income $ 106,110 $ 229,312 $ 350,830
Adjustments to reconcile net income to cash provided by operating activities      
Depreciation and amortization 108,962 90,041 78,226
Stock-based compensation expense 28,402 38,368 7,220
ESPP expense 198 0 0
Amortization of deferred financing costs 164 235 129
Venezuelan currency devaluation charge 0 13,010 1,755
Deferred tax provision 4,868 27,995 3,621
Provision for (recovery of) bad debts 228 (3,137) 12,551
(Gain) loss on sale of assets (1,038) 289 (39,752)
Changes in fair value of marketable securities 741 (1,403) (3,891)
Change in value of contingent consideration (1,532) 0 0
Unrealized gain on derivative (210) 0 0
Increase in value of life insurance policies 0 0 (815)
Other (3,909) 0 0
Changes in operating assets and liabilities      
Accounts receivable 140,657 (43,349) (82,032)
Inventories 41,502 (30,282) (85,654)
Other current assets 16,981 (7,926) (1,698)
Other assets 1,333 (1,619) (1,430)
Accounts payable (3,035) 4,991 (5,278)
Deferred revenue (18,473) 13,505 39,437
Accrued expenses and other current liabilities 3,971 32,915 (2,744)
Other noncurrent liabilities 1,838 5,915 6,956
Net cash provided by operating activities 427,758 368,860 277,431
Cash flows from investing activities      
Acquisition of Timco Services, Inc. (net of acquired cash) (78,676) 0 0
Purchase of property, plant and equipment (99,723) (172,952) (184,504)
Proceeds from sale of assets 4,579 848 50,959
Purchase of marketable securities (869) (1,539) (1,813)
Premiums on life insurance policies 0 0 (2,142)
Net cash used in investing activities (174,689) (173,643) (137,500)
Cash flows from financing activities      
Proceeds from initial public offering, net of offering costs 0 0 711,511
Repayments of borrowings (765) (72) (472,070)
Proceeds from borrowings 151 0 170
Deferred financing costs 0 0 (1,000)
Dividends paid on common stock (92,844) (69,311) (11,514)
Dividends paid on preferred stock (2) (1) 0
Distribution to noncontrolling interest (43,539) (41,565) (11,496)
Treasury shares withheld (4,497) (4,801) 0
Proceeds from the issuance of ESPP shares 287 0 0
Distributions to stockholders 0 0 (105,367)
Net cash provided by (used in) financing activities (141,209) (115,750) 110,234
Effect of exchange rate changes on cash due to Venezuelan devaluation 0 (1,040) 575
Effect of exchange rate changes on cash 1,145 5,980 1,262
Net increase in cash 113,005 84,407 252,002
Cash and cash equivalents at beginning of period 489,354 404,947 152,945
Cash and cash equivalents at end of period $ 602,359 $ 489,354 $ 404,947