Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 36,582	$ 11,215
Accounts receivable, net of allowance for doubtful accounts of $32,565 and $29,332, respectively	276,880	216,626
Other current assets	79,803	66,895
Total current assets	393,265	294,736
Property and equipment, net	3,337,765	1,709,053
Goodwill	2,771,365	2,128,215
Intangible assets, net	102,593	59,575
Deferred tax assets - noncurrent	41,753	49,114
Other assets	49,618	38,515
Total assets	6,696,359	4,279,208
Current liabilities:
Current portion of long-term debt	69,223	45,360
Accounts payable	118,210	91,341
Accrued salaries and benefits	112,714	80,696
Other accrued liabilities	108,663	72,806
Total current liabilities	408,810	290,203
Long-term debt	3,497,569	2,195,384
Deferred tax liabilities - noncurrent	94,882	23,936
Other liabilities	124,492	78,602
Total liabilities	4,125,753	2,588,125
Redeemable noncontrolling interests	$ 7,736	$ 8,055
Equity:
Preferred stock, $0.01 par value; 10,000,000 shares authorized, no shares issued
Common stock, $0.01 par value; 180,000,000 and 90,000,000 shares authorized at March 31, 2016 and December 31, 2015, respectively; 86,539,997 and 70,745,746 issued and outstanding as of March 31, 2016 and December 31, 2015, respectively	$ 865	$ 707
Additional paid-in capital	2,475,383	1,572,972
Accumulated other comprehensive loss	(153,062)	(104,647)
Retained earnings	239,684	213,996
Total equity	2,562,870	1,683,028
Total liabilities and equity	$ 6,696,359	$ 4,279,208