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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
OPERATING ACTIVITIES        
Net income $ 296,013 $ 338,382 $ 579,700 $ 662,979
Adjustments to reconcile net income to net cash provided from operating activities:        
Depreciation, amortization and depletion 125,302 116,091 242,265 226,544
Equity earnings of affiliate, net of dividends received (1,658) (3,583) (2,148) (6,997)
Loss (gain) on currency translation effect (8,285) (119) (19,238) (5,807)
(Benefit) provision for deferred income taxes (40,212) 27,498 (64,910) (56,822)
Other, net 723 279 1,295 552
Change in operating assets and liabilities:        
Decrease (increase) in accounts receivable 20,076 (39,843) 59,126 (49,917)
Decrease (increase) in inventories (53,261) (58,684) (107,960) (160,745)
(Decrease) increase in accounts payable and accrued liabilities 53,343 (27,234) (149,304) 42,079
Decrease (increase) in other operating assets and liabilities (57,291) (19,268) (5,637) 29,888
Net cash provided by operating activities 334,750 333,519 533,189 681,754
INVESTING ACTIVITIES        
Capital investments (284,937) (360,106) (507,740) (697,034)
Proceeds from (purchase of) short-term investments, net (489,533) (16,873) (234,764) (81,615)
Sale of property 2,956 4,587 2,956 4,881
Net cash used in investing activities (771,514) (372,392) (739,548) (773,768)
FINANCING ACTIVITIES        
Proceeds from issuance of debt 1,995,790   2,045,790  
Repayments of debt (66,000)   (66,000)  
Payments of debt issuance costs (9,729)   (9,729)  
Cash dividends paid to common stockholders (79,804) (83,346) (160,290) (183,372)
Distributions to non-controlling interest (217) (197) (412) (499)
Repurchase of common shares (44,461) (13,030) (414,565) (65,509)
Other 322 249 322 249
Net cash provided by (used in) financing activities 1,795,901 (96,324) 1,395,116 (249,131)
Effect of exchange rate changes on cash and cash equivalents 21,068 (2,540) 19,616 3,814
Increase (decrease) in cash and cash equivalents 1,380,205 (137,737) 1,208,373 (337,331)
Cash and cash equivalents, at beginning of period 192,138 1,473,101 363,970 1,672,695
Cash and cash equivalents, at end of period $ 1,572,343 $ 1,335,364 $ 1,572,343 $ 1,335,364