Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows provided by operating activities:
Net income	$ 10,953	$ 11,515
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion	9,787	10,608
Deferred income tax expense	6,188	6,989
Amortization of stock based compensation	2,067	1,497
Provision for doubtful accounts, service credits and other	645	1,040
Adjustment of non-cash transaction taxes	(214)	(530)
(Gain) Loss on disposals of property and equipment	3	(794)
Changes in assets and liabilities:
Accounts receivable	(1,389)	1,896
Prepaid expenses and other assets	27	1,878
Accounts payable, accrued liabilities and accrued compensation and benefits	(1,402)	(4,621)
Deferred revenue	3,109	4,002
Other long-term liabilities	(336)	45
Net cash provided by operating activities	29,438	33,525
Cash flows used in investing activities:
Purchase of property and equipment	(4,378)	(4,450)
Proceeds from disposals of property and equipment	1	807
Net cash used in investing activities	(4,377)	(3,643)
Cash flows used in financing activities:
Cash dividends to stockholders	(7,718)	(8,739)
Purchase of common stock	(6,214)	(11,804)
Employee stock based compensation tax withholding	0	(3,825)
Net cash used in financing activities	(13,932)	(24,368)
Net increase in cash and cash equivalents	11,129	5,514
Cash and cash equivalents, beginning of period	111,332	107,869
Cash and cash equivalents, end of period	122,461	113,383
Supplemental disclosure:
Income taxes paid	$ 681	$ 1,169