Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net (loss) income	$ (8,580,000)	$ 31,368,000	$ 73,472,000
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization of property and equipment	89,124,000	66,591,000	55,355,000
Loss on disposal of property and equipment	569,000	1,994,000	1,307,000
Income tax benefit	(981,000)	0	0
Amortization of debt issuance costs	1,303,000	922,000	625,000
Bad debts	423,000	383,000	242,000
Loss on extinguishment of debt	2,065,000	0	212,000
Equity in net losses (earnings) on investments	1,077,000	5,764,000	(821,000)
Gain on sale of asset	0	0	(248,000)
Planet3 impairment	0	7,696,000	0
Amortization of notes receivable discount	0	(267,000)	0
Other income	0	0	(147,000)
Equity-based compensation	84,790,000	5,935,000	5,237,000
Changes in operating assets and liabilities:
Accounts receivable	(6,435,000)	(1,101,000)	(3,566,000)
Prepaid expenses	(1,116,000)	187,000	(487,000)
Other current assets	(261,000)	(122,000)	(781,000)
Other assets	(1,221,000)	(463,000)	(3,229,000)
Accounts payable	5,248,000	634,000	(1,155,000)
Accrued interest, capital lease obligations	(143,000)	64,000	108,000
Accrued salaries and benefits	991,000	3,144,000	412,000
Accrued expenses	(2,435,000)	4,353,000	(153,000)
Accrued impact fee expense	(27,018,000)	27,018,000	0
Deferred revenue	6,006,000	10,605,000	1,797,000
Customer deposits	1,695,000	1,360,000	1,101,000
Net cash provided by operating activities	145,101,000	166,065,000	129,281,000
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of property and equipment	(402,561,000)	(287,097,000)	(190,113,000)
Acquisition of intangible asset	(32,000)	0	(449,000)
Proceeds from sale of property and equipment	100,000	0	1,243,000
Proceeds from notes receivable	211,000	468,000	0
Purchase of notes receivable	0	(3,000,000)	(485,000)
Purchase of investments	0	(1,500,000)	(6,540,000)
Purchase of portfolio energy credits	(169,000)	(872,000)	0
Net cash used in investing activities	(402,451,000)	(292,001,000)	(196,344,000)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock sold in initial public offering, net of offering costs	572,432,000	0	0
Proceeds from borrowings	976,000,000	189,000,000	321,883,000
Long-term deposit	598,000	0	(4,440,000)
Repayment of borrowings, including capital lease obligations	(854,991,000)	(10,000,000)	(223,600,000)
Debt issuance costs on new loan	(8,968,000)	(1,005,000)	(2,756,000)
Issuance of membership units upon exercise of unit options	0	0	75,000
Taxes paid for net settlement of exercised options	0	(290,000)	(1,558,000)
Distributions paid to members and non-controlling interests	(185,265,000)	(28,100,000)	(20,519,000)
Dividends paid to Class A common stockholders	(503,000)	0	0
Repurchase of member options	0	(15,148,000)	(1,392,000)
Net cash provided by financing activities	499,303,000	134,457,000	67,693,000
NET INCREASE IN CASH	241,953,000	8,521,000	630,000
CASH — Beginning of year	22,713,000	14,192,000	13,562,000
CASH — End of year	264,666,000	22,713,000	14,192,000
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid for interest, net of amounts capitalized	23,494,000	8,415,000	7,123,000
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING INFORMATION:
(Decrease) increase in liabilities incurred to acquire property and equipment	(53,455,000)	51,413,000	(3,125,000)
Liability incurred upon acquisition of capital lease asset	0	4,000,000	0
Forgiveness of note receivable in exchange for capital lease asset	0	2,100,000	0
Liability incurred related to investment in Planet3	0	0	1,500,000
Distributions declared but not paid	152,000	757,000	623,000
Net settlement of recourse notes including interest issued to members	0	0	18,256,000
Net settlement of outstanding vested options	0	744,000	3,878,000
Distributions used for payment of option loans and related interest	$ 173,000	$ 10,000	$ 9,000