Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 68,279	$ 137,385
Restricted-use investment securities	2,784	3,926
Accounts receivable, net	109,636	69,018
Inventories	40,261	24,156
Prepaid expenses and other current assets	58,202	44,306
Total current assets	279,162	278,791
Property and equipment, net:
Property and equipment, at cost	2,073,684	1,968,565
Accumulated depreciation	(807,455)	(757,310)
Total property and equipment, net	1,266,229	1,211,255
Other assets:
Debt issuance costs	3,589	4,188
Deposits and other assets	11,718	9,218
Goodwill	630,248	630,248
Intangible assets, net of accumulated amortization of $18,568 and $17,135 as of June 30, 2017 and December 31, 2016, respectively	352,741	353,972
Total other assets	998,296	997,626
Total assets	2,543,687	2,487,672
Current liabilities:
Accounts payable	75,180	26,209
Accrued compensation, payroll taxes and benefits	20,565	31,039
Accrued insurance reserves	40,803	42,443
Accrued interest payable	26,483	27,684
Other accrued liabilities	42,413	35,461
Deferred revenue	195,319	123,955
Current portion of long-term debt	28,867	29,161
Total current liabilities	429,630	315,952
Noncurrent liabilities:
Long-term debt	2,019,190	1,624,486
Other long-term liabilities	47,952	48,568
Deferred income taxes	96,328	199,280
Total noncurrent liabilities	2,163,470	1,872,334
Total liabilities	2,593,100	2,188,286
Redeemable noncontrolling interests	505,321	485,876
Stockholders' deficit:
Preferred stock, $1.00 par value	0	0
Common stock, $0.025 par value, 140,000,000 shares authorized; 85,563,377 and 90,849,428 shares issued and outstanding at June 30, 2017 and December 31, 2016, respectively	2,139	2,271
Capital in excess of par value	1,094,658	1,116,227
Accumulated deficit	(1,589,693)	(1,237,804)
Accumulated other comprehensive loss, net of tax	(61,838)	(67,184)
Total stockholders' deficit	(554,734)	(186,490)
Total liabilities and deficit	$ 2,543,687	$ 2,487,672