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Selected Unaudited Quarterly Information (Details) - USD ($) $ / shares in Units, $ in Thousands	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, 2018	Dec. 31, 2017	Dec. 31, 2016
Selected Unaudited Quarterly Information
Revenues	$ 66,578	$ 68,705	$ 66,694	$ 66,893	$ 66,835	$ 68,626	$ 68,371	$ 68,756	$ 268,870	$ 272,588	$ 249,888
Income (loss) from continuing operations	1,371	9,608	665	1,425	(4,932)	1,903	(17,395)	4,480
Net income (loss)	$ 1,371	$ 9,608	$ 665	$ 1,425	$ (4,932)	$ 1,903	$ (17,395)	$ 4,480	$ 13,069	$ (15,944)	$ 8,378
Basic and diluted net income (loss) per share	$ 0.01	$ 0.09	$ 0.01	$ 0.01	$ (0.05)	$ 0.02	$ (0.16)	$ 0.04	$ 0.12	$ (0.15)	$ 0.08
Weighted average number of shares outstanding	107,231,000	107,231,000	107,231,000	107,231,000	107,231,000	107,231,000	107,231,000	107,231,000	107,231,000	107,231,000	102,843,000

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 tax of income (loss) from continuing operations attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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-Name Accounting Standards Codification
-Topic 260
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-Section 50
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ 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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