Condensed Consolidating Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
ASSETS
Cash and cash equivalents	$ 238,848	$ 202,463	$ 205,953	$ 193,441
Receivables, net	151,672	107,336
Other current assets	64,803	35,074
Total current assets	455,323	344,873
Property and equipment, at cost, net	83,611	84,061
Goodwill	80,519	78,905
Intangible assets, net	14,749	15,738
Notes receivable, net of allowances	139,803	110,608
Investments, employee benefit plans, at fair value	19,749	16,975
Investment in affiliates	0	0
Advances to affiliates	0	0
Deferred income taxes	7,835	52,812
Other assets	159,603	148,496
Total assets	961,192	852,468
Current liabilities
Accounts payable	68,261	48,071
Accrued expenses and other current liabilities	66,515	80,388
Deferred revenue	136,956	133,218
Other current liabilities	1,302	1,991
Total current liabilities	273,034	263,668
Long-term debt	800,001	839,409
Deferred compensation and retirement plan obligations	24,355	21,595
Advances from affiliates	0	0
Other liabilities	64,182	39,145
Total liabilities	1,161,572	1,163,817
Total shareholders’ (deficit) equity	(200,380)	(311,349)
Total liabilities and shareholders’ deficit	961,192	852,468
Parent
ASSETS
Cash and cash equivalents	25,521	14,696	18,530	13,529
Receivables, net	138,257	96,128
Other current assets	11,674	9,120
Total current assets	175,452	119,944
Property and equipment, at cost, net	48,003	44,236
Goodwill	65,813	65,813
Intangible assets, net	4,816	5,279
Notes receivable, net of allowances	22,121	16,285
Investments, employee benefit plans, at fair value	0	0
Investment in affiliates	490,505	526,166
Advances to affiliates	10,114	14,929
Deferred income taxes	0	40,459
Other assets	189	18,259
Total assets	817,013	851,370
Current liabilities
Accounts payable	20,956	14,296
Accrued expenses and other current liabilities	21,434	31,352
Deferred revenue	12,749	132,217
Other current liabilities	26,867	8,480
Total current liabilities	82,006	186,345
Long-term debt	787,764	826,551
Deferred compensation and retirement plan obligations	0	0
Advances from affiliates	111,052	135,879
Other liabilities	36,571	13,944
Total liabilities	1,017,393	1,162,719
Total shareholders’ (deficit) equity	(200,380)	(311,349)
Total liabilities and shareholders’ deficit	817,013	851,370
Guarantor Subsidiaries
ASSETS
Cash and cash equivalents	130	159	589	19
Receivables, net	1,891	1,556
Other current assets	64,539	29,281
Total current assets	66,560	30,996
Property and equipment, at cost, net	18,840	21,718
Goodwill	0	0
Intangible assets, net	3,046	3,494
Notes receivable, net of allowances	54,881	42,398
Investments, employee benefit plans, at fair value	19,749	16,975
Investment in affiliates	49,428	50,798
Advances to affiliates	103,322	123,074
Deferred income taxes	16,419	14,234
Other assets	117,432	76,933
Total assets	449,677	380,620
Current liabilities
Accounts payable	43,764	29,705
Accrued expenses and other current liabilities	35,657	45,179
Deferred revenue	122,303	0
Other current liabilities	0	7
Total current liabilities	201,724	74,891
Long-term debt	3,712	3,712
Deferred compensation and retirement plan obligations	24,342	21,584
Advances from affiliates	1,414	1,188
Other liabilities	14,079	15,631
Total liabilities	245,271	117,006
Total shareholders’ (deficit) equity	204,406	263,614
Total liabilities and shareholders’ deficit	449,677	380,620
Non-Guarantor Subsidiaries
ASSETS
Cash and cash equivalents	213,197	187,608	186,834	179,893
Receivables, net	12,014	9,802
Other current assets	15,483	4,470
Total current assets	240,694	201,880
Property and equipment, at cost, net	16,768	18,107
Goodwill	14,706	13,092
Intangible assets, net	6,887	6,965
Notes receivable, net of allowances	62,801	51,925
Investments, employee benefit plans, at fair value	0	0
Investment in affiliates	0	0
Advances to affiliates	0	17
Deferred income taxes	0	0
Other assets	41,982	53,304
Total assets	383,838	345,290
Current liabilities
Accounts payable	4,031	4,220
Accrued expenses and other current liabilities	9,424	3,857
Deferred revenue	1,930	1,107
Other current liabilities	1,302	1,195
Total current liabilities	16,687	10,379
Long-term debt	8,525	9,146
Deferred compensation and retirement plan obligations	13	11
Advances from affiliates	970	953
Other liabilities	22,116	11,451
Total liabilities	48,311	31,940
Total shareholders’ (deficit) equity	335,527	313,350
Total liabilities and shareholders’ deficit	383,838	345,290
Eliminations
ASSETS
Cash and cash equivalents	0	0	$ 0	$ 0
Receivables, net	(490)	(150)
Other current assets	(26,893)	(7,797)
Total current assets	(27,383)	(7,947)
Property and equipment, at cost, net	0	0
Goodwill	0	0
Intangible assets, net	0	0
Notes receivable, net of allowances	0	0
Investments, employee benefit plans, at fair value	0	0
Investment in affiliates	(539,933)	(576,964)
Advances to affiliates	(113,436)	(138,020)
Deferred income taxes	(8,584)	(1,881)
Other assets	0	0
Total assets	(689,336)	(724,812)
Current liabilities
Accounts payable	(490)	(150)
Accrued expenses and other current liabilities	0	0
Deferred revenue	(26)	(106)
Other current liabilities	(26,867)	(7,691)
Total current liabilities	(27,383)	(7,947)
Long-term debt	0	0
Deferred compensation and retirement plan obligations	0	0
Advances from affiliates	(113,436)	(138,020)
Other liabilities	(8,584)	(1,881)
Total liabilities	(149,403)	(147,848)
Total shareholders’ (deficit) equity	(539,933)	(576,964)
Total liabilities and shareholders’ deficit	$ (689,336)	$ (724,812)