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Significant Accounting Policies (Narrative) (Details) - USD ($)	3 Months Ended												12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2019
Significant Accounting Policies [Line Items]
Impairment charges on minority investments													$ 1,373,000	$ 1,743,000
Carrying amount of cost method investments	$ 8,483,000				$ 8,263,000								8,483,000	8,263,000
Finite lives impairment charge													0	0	$ 0
Redeemable noncontrolling interests	8,872,000				8,872,000								8,872,000	8,872,000
Advertising costs													13,562,000	13,683,000	12,469,000
Decrease (increase) in accumulated deficit	(722,701,000)				(677,772,000)								(722,701,000)	(677,772,000)
Revenue	180,712,000	$ 164,511,000	$ 176,568,000	$ 165,869,000	177,264,000	$ 152,907,000	$ 159,467,000	$ 156,431,000	$ 165,937,000	$ 156,362,000	$ 158,111,000	$ 152,555,000	687,660,000	646,069,000	632,965,000
Net loss	4,136,000	$ 11,550,000	$ 8,862,000	$ 20,957,000	10,134,000	$ 37,670,000	$ 8,416,000	$ 9,971,000	$ (5,230,000)	$ 21,213,000	$ 4,648,000	$ 17,788,000	45,505,000	66,191,000	$ 38,419,000
Decrease in other assets	(26,814,000)				(27,136,000)								(26,814,000)	(27,136,000)
Decrease in deferred revenue	(32,432,000)				(29,214,000)								(32,432,000)	(29,214,000)
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Significant Accounting Policies [Line Items]
Decrease (increase) in accumulated deficit					$ 576,000									$ 576,000
Pro Forma | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Significant Accounting Policies [Line Items]
Decrease (increase) in accumulated deficit	(244,000)												(244,000)
Revenue													332,000
Net loss													332,000
Decrease in other assets	567,000												567,000
Decrease in deferred revenue	$ 323,000												$ 323,000
Forecast | Subsequent Event | Accounting Standards Update 2016-02 | Minimum
Significant Accounting Policies [Line Items]
Right-of-use asset. operating lease																$ 40,000,000
Operating lease liability																40,000,000
Forecast | Subsequent Event | Accounting Standards Update 2016-02 | Maximum
Significant Accounting Policies [Line Items]
Right-of-use asset. operating lease																50,000,000
Operating lease liability																$ 50,000,000

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