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Basis of Presentation and Summary of Significant Accounting Policies - Subscriber System Depreciation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |
Amortization of deferred subscriber acquisition costs | $ 30,000 | $ 23,000 | $ 58,830 | $ 45,416
Subscriber system assets, depreciation expense | $ 124,000 | $ 126,000 | $ 247,000 | $ 259,000

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- Definition Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123353750&loc=SL49131252-203054 + Details
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- References No definition available. + Details
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