Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:
Net income	$ 19,515	$ 24,957
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion	11,487	13,845
Amortization of deferred financing costs	194	194
Deferred income tax expense	12,226	15,239
Amortization of stock based compensation	2,200	902
Provision for doubtful accounts, service credits and other	1,337	1,239
Adjustment of non-cash transaction taxes	(354)	(366)
Loss/(Gain) on disposals of property and equipment	172	(159)
Changes in assets and liabilities:
Accounts receivable	3,129	(2,062)
Prepaid expenses and other assets	(285)	(531)
Accounts payable and accrued liabilities	(8,025)	(1,788)
Deferred revenue	(2,292)	1,235
Net cash provided by operating activities	39,304	52,705
Cash flows from investing activities:
Purchase of property and equipment	(7,772)	(7,135)
Proceeds from disposals of property and equipment	10	332
Acquisitions, net of cash acquired	0	(3,000)
Net cash used in investing activities	(7,762)	(9,803)
Cash flows from financing activities:
Repayment of debt	0	(28,250)
Cash dividends to stockholders	(9,606)	(13,829)
Payments for Repurchase of Common Stock	0	(4,933)
Net cash used in financing activities	(9,606)	(47,012)
Net increase/(decrease) in cash and cash equivalents	21,936	(4,110)
Cash and cash equivalents, beginning of period	61,046	53,655
Cash and cash equivalents, end of period	82,982	49,545
Supplemental disclosure:
Interest paid	9	285
Income taxes paid	$ 926	$ 1,376