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Selected Unaudited Quarterly Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Selected Unaudited Quarterly Information
Revenue	$ 68,997	$ 68,539	$ 66,813	$ 64,716	$ 66,578	$ 68,705	$ 66,694	$ 66,893	$ 269,065	$ 268,870	$ 272,588
Net income (loss)	$ 3,648	$ 2,399	$ 1,633	$ (1,205)	$ 1,371	$ 9,608	$ 665	$ 1,425	$ 6,475	$ 13,069	$ (15,944)
Basic and diluted net income (loss) per share	$ 0.03	$ 0.02	$ 0.02	$ (0.01)	$ 0.01	$ 0.09	$ 0.01	$ 0.01	$ 0.06	$ 0.12	$ (0.15)
Weighted average number of shares outstanding	107,240,000	107,231,000	107,231,000	107,231,000	107,231,000	107,231,000	107,231,000	107,231,000	107,233,000	107,231,000	107,231,000

X

- Definition

The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

+ References

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

+ References

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Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

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