Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 30,716	$ 11,215
Accounts receivable, net of allowance for doubtful accounts of $36,246 and $29,332, respectively	285,132	216,626
Other current assets	76,519	66,895
Total current assets	392,367	294,736
Property and equipment, net	3,274,540	1,709,053
Goodwill	2,832,201	2,128,215
Intangible assets, net	84,996	59,575
Deferred tax assets - noncurrent	17,929	49,114
Derivative instruments	40,459
Other assets	42,007	38,515
Total assets	6,684,499	4,279,208
Current liabilities:
Current portion of long-term debt	73,410	45,360
Accounts payable	108,211	91,341
Accrued salaries and benefits	113,392	80,696
Other accrued liabilities	124,788	72,806
Total current liabilities	419,801	290,203
Long-term debt	3,578,383	2,195,384
Deferred tax liabilities - noncurrent	85,526	23,936
Other liabilities	151,628	78,602
Total liabilities	4,235,338	2,588,125
Redeemable noncontrolling interests	12,881	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 June 30, 2016 and December 31, 2015, respectively; 86,571,040 and 70,745,746 issued and outstanding as of June 30, 2016 and December 31, 2015, respectively	865	707
Additional paid-in capital	2,481,897	1,572,972
Accumulated other comprehensive loss	(342,611)	(104,647)
Retained earnings	296,129	213,996
Total equity	2,436,280	1,683,028
Total liabilities and equity	$ 6,684,499	$ 4,279,208