Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows provided by operating activities:
Net income	$ 6,078	$ 10,953
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion	8,849	9,787
Deferred income tax expense	1,118	6,188
Stock based compensation	2,815	2,067
Provision for doubtful accounts, service credits and other	767	648
Adjustment of non-cash transaction taxes	(754)	(214)
Changes in assets and liabilities:
Accounts receivable	(4,156)	(1,389)
Prepaid expenses, inventory, intangibles and other assets	(1,726)	27
Accounts payable, accrued liabilities and other	(319)	(1,738)
Deferred revenue	1,313	3,109
Net cash provided by operating activities	13,985	29,438
Cash flows used in investing activities:
Purchase of property and equipment, net of proceeds from disposals of property and equipment	(7,034)	(4,377)
Net cash used in investing activities	(7,034)	(4,377)
Cash flows used in financing activities:
Cash distributions to stockholders	(12,733)	(7,718)
Purchase of common stock (including commissions), net of proceeds from issuance of common stock	(9,894)	(6,214)
Net cash used in financing activities	(22,627)	(13,932)
Net (decrease) increase in cash and cash equivalents	(15,676)	11,129
Cash and cash equivalents, beginning of period	125,816	111,332
Cash and cash equivalents, end of period	110,140	122,461
Supplemental disclosure:
Income taxes paid	$ 2,300	$ 681