CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
CONSOLIDATED STATEMENTS OF INCOME
Revenue	$ 119,156	$ 117,195	$ 379,020	$ 362,602
Cost of sales (exclusive of depreciation and amortization shown separately below)	41,991	41,741	131,788	127,793
Gross profit	77,165	75,454	247,232	234,809
Selling and marketing expense	12,951	13,282	40,958	41,323
General and administrative expense	27,387	26,626	81,917	79,032
Amortization expense of intangibles	1,950	6,669	5,858	21,001
Depreciation expense	3,499	3,311	10,859	9,839
Operating income	31,378	25,566	107,640	83,614
Other income (expense):
Interest income	60	535	282	1,538
Interest expense	(1,295)	(6,485)	(4,559)	(23,874)
Other income (expense), net	(65)	(915)	893	(2,408)
Loss on extinguishment of debt		(17,925)		(18,527)
Total other expense, net	(1,300)	(24,790)	(3,384)	(43,271)
Earnings before income taxes and noncontrolling interest	30,078	776	104,256	40,343
Income tax provision	(12,973)	(624)	(41,571)	(14,911)
Net income	17,105	152	62,685	25,432
Net income attributable to noncontrolling interest	(4)	(3)	(10)	(6)
Net income attributable to common stockholders	$ 17,101	$ 149	$ 62,675	$ 25,426
Earnings per share attributable to common stockholders:
Basic (in dollars per share)	$ 0.30	$ 0.00	$ 1.10	$ 0.45
Diluted (in dollars per share)	$ 0.29	$ 0.00	$ 1.09	$ 0.45
Weighted average number of shares of common stock outstanding:
Basic (in shares)	57,353	56,714	57,199	56,448
Diluted (in shares)	57,986	57,364	57,738	57,120
Dividends declared per share of common stock (in dollars per share)	$ 0.11	$ 0.10	$ 0.22	$ 0.30