Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

Reference 1: 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 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=66902209&loc=d3e3602-108585

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
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No definition available.

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Fair value measurements (non-recurring asset impairment analyses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Sep. 30, 2014
Non-recurring fair value measurements [Line Items]
Asset impairment charges	$ 0	$ 0	$ 6,468
Internal-use software [Member]
Non-recurring fair value measurements [Line Items]
Fair value as of measurement date				$ 0
Asset impairment charges			4,036
Internal-use software [Member] \| Quoted prices in active markets for identical assets (Level 1) [Member]
Non-recurring fair value measurements [Line Items]
Fair value as of measurement date				0
Internal-use software [Member] \| Significant other observable inputs (Level 2) [Member]
Non-recurring fair value measurements [Line Items]
Fair value as of measurement date				0
Internal-use software [Member] \| Significant unobservable inputs (Level 3) [Member]
Non-recurring fair value measurements [Line Items]
Fair value as of measurement date				0
Customer lists/relationships [Member]
Non-recurring fair value measurements [Line Items]
Fair value as of measurement date				0
Asset impairment charges			1,952
Customer lists/relationships [Member] \| Quoted prices in active markets for identical assets (Level 1) [Member]
Non-recurring fair value measurements [Line Items]
Fair value as of measurement date				0
Customer lists/relationships [Member] \| Significant other observable inputs (Level 2) [Member]
Non-recurring fair value measurements [Line Items]
Fair value as of measurement date				0
Customer lists/relationships [Member] \| Significant unobservable inputs (Level 3) [Member]
Non-recurring fair value measurements [Line Items]
Fair value as of measurement date				0
Trade names [Member]
Non-recurring fair value measurements [Line Items]
Fair value as of measurement date				0
Asset impairment charges			$ 480
Trade names [Member] \| Quoted prices in active markets for identical assets (Level 1) [Member]
Non-recurring fair value measurements [Line Items]
Fair value as of measurement date				0
Trade names [Member] \| Significant other observable inputs (Level 2) [Member]
Non-recurring fair value measurements [Line Items]
Fair value as of measurement date				0
Trade names [Member] \| Significant unobservable inputs (Level 3) [Member]
Non-recurring fair value measurements [Line Items]
Fair value as of measurement date				$ 0