Unrestricted Subsidiaries Unrestricted Subsidiaries (Results of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Total revenues	$ 211,800	$ 176,038	$ 412,302	$ 337,291
Cost of revenues	35,591	29,494	69,878	57,681
Gross Profit	176,209	146,544	342,424	279,610
Selling and Marketing Expense	48,617	40,421	96,729	78,011
Research and Development Expense	9,213	8,969	18,201	17,415
General and Administrative Expense	59,434	47,088	115,211	93,588
Operating Expenses	117,264	96,478	230,141	189,014
Income from operations	58,945	50,066	112,283	90,596
Interest expense (income), net	10,301	10,881	20,534	21,194
Other expense (income), net	(213)	88	(87)	(696)
Income (loss) before income taxes	48,857	39,097	91,836	70,098
Income Tax Expense (Benefit)	15,087	181	28,123	9,304
Net Income (Loss) Attributable to Parent	33,770	38,916	63,713	60,794
Unrestricted Subsidiaries [Member]
Total revenues	69,385	51,103	131,842	95,524
Cost of revenues	5,560	5,017	10,871	9,371
Gross Profit	63,825	46,086	120,971	86,153
Selling and Marketing Expense	27,244	19,182	53,705	36,844
Research and Development Expense	3,169	2,167	5,652	4,068
General and Administrative Expense	23,706	16,918	46,524	34,897
Operating Expenses	54,119	38,267	105,881	75,809
Income from operations	9,706	7,819	15,090	10,344
Interest expense (income), net	4,486	2,801	8,613	5,318
Other expense (income), net	315	(145)	487	99
Income (loss) before income taxes	4,905	5,163	5,990	4,927
Income Tax Expense (Benefit)	1,691	2,878	2,271	3,197
Net Income (Loss) Attributable to Parent	$ 3,214	$ 2,285	$ 3,719	$ 1,730