Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities
Net loss	$ (263)	$ (14,630)
Adjustments to reconcile net loss including non-controlling interests to net cash provided by operating activities:
Depreciation and amortization of property and equipment	37,868	30,999
Amortization of intangible assets	1,395	1,821
Impairment loss and loss on disposal of fixed assets, net	127	440
Stock-based compensation	6,072	7,332
Change in deferred income taxes	0	243
Other	8	53
Changes in operating assets and liabilities:
Accounts receivable	(12,567)	15,975
Prepaid expenses and other assets	(22)	(553)
Accounts payable	704	(2,556)
Accrued expenses and other liabilities	1,018	5,630
Deferred revenue	(1,576)	2,599
Net cash provided by operating activities	32,764	47,353
Cash flows from investing activities
Purchases of property and equipment	(42,918)	(31,917)
Payments for asset acquisition	0	(1,150)
Net cash used in investing activities	(42,918)	(33,067)
Cash flows from financing activities
Principal payments on credit facility	(438)	(10,656)
Proceeds from exercise of stock options	8,455	3,624
Payments of capital leases and notes payable	(2,865)	(1,819)
Payments of withholding tax on net issuance of restricted stock units	(7,586)	(2,458)
Payments to non-controlling interests	(614)	(125)
Net cash used in financing activities	(3,048)	(11,434)
Effect of exchange rates on cash	(23)	(16)
Net (decrease) increase in cash, cash equivalents, and restricted cash	(13,225)	2,836
Cash, cash equivalents, and restricted cash at beginning of period	26,685	19,485
Cash, cash equivalents, and restricted cash at end of period	13,460	22,321
Supplemental disclosure of non-cash investing and financing activities
Property and equipment costs in accounts payable, accrued expenses and other liabilities	26,756	22,015
Purchase of equipment and prepaid maintenance services under capital financing arrangements	5,068	1,976
Capitalized stock-based compensation included in property and equipment costs	$ 392	$ 367