CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 200,688	$ 264,093
Short-term investments	27,907	31,109
Accounts receivable, net	514,446	508,355
Inventory, net	109,461	103,595
Assets held for sale	77,118	76,668
Other current assets	193,036	172,019
Total current assets	1,122,656	1,155,839
Property, plant and equipment, net	6,218,699	6,267,583
Goodwill	166,999	166,917
Deferred tax assets	373,973	366,586
Other long-term assets	212,985	230,090
Total assets	8,095,312	8,187,015
Current liabilities:
Less: current portion	313	297
Trade accounts payable	241,332	264,578
Accrued liabilities	497,364	543,248
Income taxes payable	32,640	13,811
Total current liabilities	771,649	821,934
Long-term debt	3,661,665	3,578,335
Other long-term liabilities	467,248	522,456
Deferred income taxes	8,356	9,495
Total liabilities	4,908,918	4,932,220
Commitments and contingencies (Note 17)
Shareholders' equity:
Common shares, par value $0.001 per share: Authorized common shares 800,000; issued 333,597 and 333,598, respectively	336	334
Capital in excess of par value	2,612,457	2,521,332
Accumulated other comprehensive income (loss)	(11,336)	(12,119)
Retained earnings	1,872,440	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	3,177,948	3,247,025
Noncontrolling interest	8,446	7,770
Total equity	3,186,394	3,254,795
Total liabilities and equity	$ 8,095,312	$ 8,187,015