Divestments - Results of Operations, Recall Divestments (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Revenue	$ 6,562		$ 10,571
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	2,334		4,210
Discontinued Operation, Tax Effect of Discontinued Operation	293		582
Income (loss) from discontinued operations, net of tax	2,041	$ 0	3,628	$ 0
Seattle/Atlanta Divestments \| Discontinued Operations, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Revenue	3,200		5,010
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	1,534		2,468
Discontinued Operation, Tax Effect of Discontinued Operation	70		114
Income (loss) from discontinued operations, net of tax	1,464		2,354
Recall Canadian Divestments \| Discontinued Operations, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Revenue	2,977		4,865
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	888		1,755
Discontinued Operation, Tax Effect of Discontinued Operation	239		471
Income (loss) from discontinued operations, net of tax	649		1,284
UK Divestments \| Discontinued Operations, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Revenue	385		696
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	(88)		(13)
Discontinued Operation, Tax Effect of Discontinued Operation	(16)		(3)
Income (loss) from discontinued operations, net of tax	(72)		(10)
Initial United States Divestments \| Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Revenue	0		0
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	0		0
Discontinued Operation, Tax Effect of Discontinued Operation	0		0
Income (loss) from discontinued operations, net of tax	$ 0		$ 0

Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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