Unrestricted Subsidiaries Unrestricted Subsidiaries (Results of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Total revenues	$ 178,701	$ 153,018	$ 515,992	$ 431,886
Cost of revenues	30,669	28,044	88,350	76,991
Gross Profit	148,032	124,974	427,642	354,895
Selling and Marketing Expense	38,808	37,047	116,819	105,335
Research and Development Expense	8,289	7,637	25,704	22,451
General and Administrative Expense	45,202	33,812	138,790	94,209
Operating Expenses	92,299	78,496	281,313	221,995
Income from operations	55,733	46,478	146,329	132,900
Interest expense (income), net	10,259	10,123	31,453	20,753
Other expense (income), net	1,086	251	390	(254)
Income (loss) before income taxes	44,388	36,104	114,486	112,401
Income Tax Expense (Benefit)	7,013	7,345	16,317	19,828
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	37,375	28,759	98,169	92,573
Unrestricted Subsidiaries [Member]
Total revenues	96,754	43,618	147,858	115,801
Cost of revenues	10,276	5,299	15,293	13,596
Gross Profit	86,478	38,319	132,565	102,205
Selling and Marketing Expense	36,715	18,163	55,896	49,552
Research and Development Expense	3,817	1,565	5,984	3,792
General and Administrative Expense	38,151	13,527	55,070	35,320
Operating Expenses	78,683	33,255	116,950	88,664
Income from operations	7,795	5,064	15,615	13,541
Interest expense (income), net	5,216	(3)	8,016	(5)
Other expense (income), net	673	518	529	100
Income (loss) before income taxes	1,906	4,549	7,070	13,446
Income Tax Expense (Benefit)	2,542	4,015	5,421	8,250
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ (636)	$ 534	$ 1,649	$ 5,196