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Summary of Significant Accounting Policies - Summarizes Depreciation and Finance Lease Amortization Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accounting Policies [Abstract]
Cost of revenues	$ 5,341	$ 5,867	$ 10,560	$ 10,495
Operating expense	13,080	14,115	25,882	28,566
General and administrative expense	$ 715	$ 835	$ 1,595	$ 1,636

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- Definition

Operating Expense, Depreciation And Amortization

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- Definition

Selling, General And Administrative Expense, Depreciation And Amortization

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- Definition

Amount of expense for allocation of cost of tangible and intangible assets over their useful lives directly used in production of good and rendering of service.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(b)(2))
-URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227

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