Variable Interest Entities - Schedule of Variable Interest Entities (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Variable Interest Entity [Line Items]
Cash and cash equivalents	$ 162,600	$ 83,932	$ 87,641	$ 94,808
Trade receivables	48,331	37,510
Prepaid expenses	11,787	13,803
Other current assets	12,658	7,350
Total current assets	304,090	218,057
Property, plant and equipment, net	3,682,269	3,135,162
Finite-lived intangible assets, net	110,617	91,895
Other assets	24,864	24,390
Total assets	4,404,279	3,752,767
Accounts payable and other accrued liabilities	64,974	31,305
Accrued construction costs	4,146	1,098
Accrued interest	18,222	9,545
Other current liabilities	9,121	4,698
Total current liabilities	294,205	366,875
Finite-lived intangible liability, net	52,929	54,663
Other long-term liabilities	91,685	60,673
Total liabilities	2,276,565	1,874,023
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Cash and cash equivalents	29,062	12,745
Restricted cash	4,300	4,291
Trade receivables	7,964	6,290
Prepaid expenses	3,684	4,468
Other current assets	4,044	1,456
Total current assets	49,054	29,250
Restricted cash	6,549	3,203
Property, plant and equipment, net	2,040,151	1,538,793
Finite-lived intangible assets, net	12,519	2,070
Other assets	13,550	13,622
Total assets	2,121,823	1,586,938
Accounts payable and other accrued liabilities	15,024	12,635
Accrued construction costs	3,628	709
Accrued interest	272	77
Other current liabilities	3,022	2,090
Total current liabilities	21,946	15,511
Finite-lived intangible liability, net	52,929	54,663
Other long-term liabilities	36,457	20,081
Total liabilities	$ 111,332	$ 90,255