Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows provided by operating activities:
Net income	$ 6,895	$ 7,293
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion	6,558	7,195
Deferred income tax expense	4,346	4,086
Amortization of stock based compensation	1,368	1,104
Provision for doubtful accounts, service credits and other	322	716
Adjustment of non-cash transaction taxes	(169)	(97)
(Gain) Loss on disposals of property and equipment	(1)	(166)
Changes in assets and liabilities:
Accounts receivable	(1,421)	2,239
Prepaid expenses and other assets	1,197	741
Accounts payable, accrued liabilities and accrued compensation and benefits	(358)	(685)
Deferred revenue and customer deposits	1,126	3,070
Other long-term liabilities	16	0
Net cash provided by operating activities	19,879	25,496
Cash flows used in investing activities:
Purchase of property and equipment	(2,982)	(3,033)
Proceeds from disposals of property and equipment	1	180
Net cash used in investing activities	(2,981)	(2,853)
Cash flows used in financing activities:
Cash dividends to stockholders	(5,150)	(6,069)
Purchase of common stock	(5,985)	(3,475)
Employee stock based compensation tax withholding	0	(3,825)
Net cash used in financing activities	(11,135)	(13,369)
Net increase in cash and cash equivalents	5,763	9,274
Cash and cash equivalents, beginning of period	111,332	107,869
Cash and cash equivalents, end of period	117,095	117,143
Supplemental disclosure:
Income taxes paid	$ 598	$ 337