Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 564,017	$ 393,046
Accounts receivable, net of allowance for doubtful accounts of $28,242 and $22,076 at December 31, 2015 and December 31, 2014, respectively	428,514	926,768
Prepaid expenses	42,298	74,750
Inventory and other current assets	165,062	185,429
Assets held for sale	95,234	116,680
Total current assets	1,295,125	1,696,673
Property, plant and equipment, net	2,123,291	2,733,839
Goodwill	1,140,101	2,468,409
Notes receivable	52,382	25,970
Intangible and other long-term assets, net	303,345	392,891
Total assets	4,914,244	7,317,782
Current liabilities:
Accounts payable	114,475	225,306
Accrued expenses	271,246	363,747
Income taxes payable	9,185	40,213
Current maturities of long-term debt	29,957	20,941
Current portion of decommissioning liabilities	19,052
Liabilities Held-for-sale	4,661	61,840
Total current liabilities	448,576	712,047
Deferred income taxes	383,069	670,858
Decommissioning liabilities	98,890	88,000
Long-term debt, net	1,588,263	1,600,373
Other long-term liabilities	$ 184,634	$ 166,766
Stockholders' equity:
Preferred stock of $0.01 par value. Authorized, 5,000,000 shares; none issued
Common stock of $0.001 par value. Authorized - 250,000,000, Issued and Outstanding- 150,861,500as of December 31, 2015 Authorized - 250,000,000, Issued - 149,648,826, Outstanding - 149,708,825 at December 31, 2014	$ 151	$ 150
Additional paid in capital	2,664,517	2,620,328
Accumulated other comprehensive loss, net	(45,694)	(36,280)
Retained earnings	(408,162)	1,495,540
Total stockholders' equity	2,210,812	4,079,738
Total liabilities and stockholders' equity	$ 4,914,244	$ 7,317,782