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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of beginning and ending amount of unrecognized tax benefits excluding interest
Unrecognized tax benefit at the beginning of the period	$ 4,585	$ 4,278	$ 3,916
Increase for tax positions taken during prior year	1,823		54
Reduction due to lapse of applicable statute of limitations	(1,512)	(57)	(68)
Increases for tax positions of current period	1,946	399	376
Decreases for tax positions taken during prior year		(35)
Increases related to acquired entities	13,278
Decreases related to divested entities	(13,645)
Unrecognized tax benefit at the end of the period	6,475	4,585	4,278
Unrecognized Tax Benefits Including Interest	7,100	$ 4,800	$ 4,400
Portion of current unrecognized tax benefit expected to be recognized	$ 2,800

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- Definition

Unrecognized Tax Benefits, Decrease Resulting from Divesture

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Unrecognized Tax Benefits Including Interest

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- Definition

The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319

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Amount of unrecognized tax benefits.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
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Amount of increase in unrecognized tax benefits resulting from acquisitions.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
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