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Impairment of Long-Lived Assets (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017
Impairment of Long-Lived Assets [Abstract]
Impairment of Long-Lived Assets Held-for-use	$ 2,427	$ 4,441
Impairment of Long-Lived Assets Held-for-use, Net	$ 1,475	$ 2,699
Impairment effect on earnings per share, after tax	$ 0.05	$ 0.09

X

- Definition

Asset Impairment Charges Disclosure [Abstract]

+ References

No definition available.

+ Details

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- Definition

The amount, net of tax, of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

+ References

No definition available.

+ Details

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X

- Definition

After tax earnings per share or per unit impact arising from asset impairment.

+ References

No definition available.

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X

- Definition

The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 958
-SubTopic 225
-Section 45
-Paragraph 11
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84241808&loc=d3e92212-112881

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2921-110230

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