CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 190,556	$ 264,093
Short-term investments	29,770	31,109
Accounts receivable, net	621,640	508,355
Inventory, net	119,050	103,595
Assets held for sale	37,275	76,668
Other current assets	176,630	172,019
Total current assets	1,174,921	1,155,839
Property, plant and equipment, net	6,051,606	6,267,583
Goodwill	173,321	166,917
Deferred tax assets	444,796	366,586
Other long-term assets	243,941	230,090
Total assets	8,088,585	8,187,015
Current liabilities:
Current portion of debt	196	297
Trade accounts payable	317,314	264,578
Accrued liabilities	485,347	543,248
Income taxes payable	27,817	13,811
Total current liabilities	830,674	821,934
Long-term Debt, Excluding Current Maturities, Total	3,958,615	3,578,335
Other long-term liabilities	351,787	522,456
Deferred income taxes	20,288	9,495
Total liabilities	5,161,364	4,932,220
Commitments and contingencies (Note 8)
Shareholders' equity:
Authorized common shares 800,000; issued 335,550 and 333,598, respectively	336	334
Capital in excess of par value	2,624,711	2,521,332
Accumulated other comprehensive income (loss)	15,657	(12,119)
Retained earnings	1,556,650	2,033,427
Less: treasury shares, at cost, 49,673 and 49,673 common shares, respectively	(1,295,949)	(1,295,949)
Total shareholders' equity	2,901,405	3,247,025
Noncontrolling interest	25,816	7,770
Total equity	2,927,221	3,254,795
Total liabilities and equity	$ 8,088,585	$ 8,187,015