CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities:
Net income	$ 13,979	$ 80,246	$ 20,745
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion	12,963	13,970	16,677
Amortization of deferred financing costs	0	0	456
Deferred income tax (benefit) expense	6,926	(55,018)	4,740
Stock based compensation	854	1,868	3,838
Provisions for doubtful accounts, service credits and other		1,290	1,128
Adjustments of non-cash transaction taxes	(270)	(686)	(310)
(Gain)/Loss on disposals of property and equipment	2	(793)	3
Changes in assets and liabilities:
Accounts receivable	(1,790)	1,041	(8,013)
Prepaid expenses, intangible assets and other assets	843	658	17
Accounts payable, accrued liabilities and other	1,083	(3,556)	1,192
Deferred revenue	2,110	2,817	1,086
Net cash provided by operating activities	37,461	41,837	41,559
Cash flows from investing activities:
Purchases of property and equipment, net of proceeds from disposals of property and equipment	(6,254)	(5,565)	(7,614)
Net cash used in investing activities	(6,254)	(5,565)	(7,614)
Cash flows from financing activities:
Cash distributions to stockholders	(10,287)	(13,976)	(10,826)
Purchase of common stock (including commissions), net of proceeds from issuance of common stock	(6,436)	(15,008)	(4,325)
Employee stock based compensation tax withholding	0	(3,825)	0
Net cash used in financing activities	(16,723)	(32,809)	(15,151)
Net increase in cash and cash equivalents	14,484	3,463	18,794
Cash and cash equivalents, beginning of period	111,332	107,869	89,075
Cash and cash equivalents, end of period	125,816	111,332	107,869
Supplemental disclosure:
Income taxes paid	$ 695	$ 1,521	$ 1,448