Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities:
Net income	$ 4,890	$ 6,925
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion	4,029	3,807
Amortization of deferred financing costs	65	64
Deferred income tax expense	2,594	4,570
Amortization of stock based compensation	1,086	626
Provision for doubtful accounts, service credits and other	340	405
Adjustment of non-cash transaction taxes	(115)	(132)
Loss/(Gain) on disposals of property and equipment	(2)	(1)
Changes in assets and liabilities:
Accounts receivable	(2,586)	984
Prepaid expenses and other assets	807	161
Accounts payable and accrued liabilities	(3,675)	(1,236)
Deferred revenue	378	(503)
Net cash provided by operating activities	7,811	15,670
Cash flows from investing activities:
Purchase of property and equipment	(2,643)	(2,341)
Proceeds from disposals of property and equipment	58	1
Net cash used in investing activities	(2,585)	(2,340)
Cash flows from financing activities:
Cash dividends to stockholders	(2,707)	(2,682)
Net cash used in financing activities	(2,707)	(2,682)
Net increase/(decrease) in cash and cash equivalents	2,519	10,648
Cash and cash equivalents, beginning of period	89,075	61,046
Cash and cash equivalents, end of period	91,594	71,694
Supplemental disclosure:
Interest paid	2	4
Income taxes paid	$ 161	$ 168