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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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