CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 196,567	$ 264,093
Short-term investments	35,476	31,109
Accounts receivable, net	582,787	508,355
Inventory, net	108,141	103,595
Assets held for sale	78,407	76,668
Other current assets	172,790	172,019
Total current assets	1,174,168	1,155,839
Property, plant and equipment, net	6,142,216	6,267,583
Goodwill	167,246	166,917
Deferred tax assets	409,671	366,586
Other long-term assets	199,157	230,090
Total assets	8,092,458	8,187,015
Current liabilities:
Current portion of debt	124	297
Trade accounts payable	261,115	264,578
Accrued liabilities	592,060	543,248
Income taxes payable	23,268	13,811
Total current liabilities	876,567	821,934
Long-term debt	3,740,248	3,578,335
Other long-term liabilities	390,501	522,456
Deferred income taxes	12,364	9,495
Total liabilities	5,019,680	4,932,220
Commitments and contingencies (Note 7)
Shareholders' equity:
Authorized common shares 800,000; issued 335,499 and 333,598, respectively	336	334
Capital in excess of par value	2,617,719	2,521,332
Accumulated other comprehensive income (loss)	4,794	(12,119)
Retained earnings	1,722,335	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	3,049,235	3,247,025
Noncontrolling interest	23,543	7,770
Total equity	3,072,778	3,254,795
Total liabilities and equity	$ 8,092,458	$ 8,187,015