Unrestricted Subsidiaries Unrestricted Subsidiaries (Results of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Total revenues	$ 176,038	$ 144,744	$ 337,291	$ 278,868
Cost of revenues	29,494	25,558	57,681	48,947
Gross Profit	146,544	119,186	279,610	229,921
Selling and Marketing Expense	40,421	35,329	78,011	68,288
Research and Development Expense	8,969	7,600	17,415	14,814
General and Administrative Expense	47,088	31,419	93,588	60,397
Operating Expenses	96,478	74,348	189,014	143,499
Income from operations	50,066	44,838	90,596	86,422
Interest expense (income), net	10,881	5,682	21,194	10,630
Other expense (income), net	88	(185)	(696)	(505)
Income (loss) before income taxes	39,097	39,341	70,098	76,297
Income Tax Expense (Benefit)	181	4,292	9,304	12,483
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	38,916	35,049	60,794	63,814
Unrestricted Subsidiaries [Member]
Total revenues	51,103	38,907	95,524	72,275
Cost of revenues	5,017	4,445	9,371	8,297
Gross Profit	46,086	34,462	86,153	63,978
Selling and Marketing Expense	19,182	16,431	36,844	31,389
Research and Development Expense	2,167	1,154	4,068	2,226
General and Administrative Expense	16,918	12,959	34,897	21,793
Operating Expenses	38,267	30,544	75,809	55,408
Income from operations	7,819	3,918	10,344	8,570
Interest expense (income), net	2,801	(3)	5,318	(1)
Other expense (income), net	(145)	(76)	99	(418)
Income (loss) before income taxes	5,163	3,997	4,927	8,989
Income Tax Expense (Benefit)	2,878	2,209	3,197	4,235
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 2,285	$ 1,788	$ 1,730	$ 4,754