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Redeemable Non-Controlling Interest (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Changes in Carrying Amount (Fair Value) of Redeemable Non-Controlling Interests [Roll Forward]
Beginning balance	$ 0
Operating results allocated to redeemable non-controlling interest partners	6,055	$ 4,057
Distributions to redeemable non-controlling interest partners	(7,336)	(4,628)
Changes in the fair value of redeemable non-controlling interest	12,894	6,169
Purchases of businesses - initial equity related to redeemable non-controlling interest	10,282	18,880
Fair value of redeemable non-controlling interest - amended partnership agreements	2,361	1,262
Ending balance	102,572	0
Carrying Amount (Fair Value) of Redeemable Non-Controlling Interest [Abstract]
Contractual time period has lapsed but holder's employment has not been terminated			$ 327	$ 24,700
Contractual time period has not lapsed and holder's employment has not been terminated			0	46,949
Holder's employment has terminated and contractual time period has expired			0	0
Holder's employment has terminated and contractual time period has not expired			0	0
Redemption value prior to excess distributed earnings			327	71,649
Excess distributions over earnings and losses			0	(2,459)
Redeemable non-controlling interests	0	0	102,572	0
Redeemable Non-Controlling Interest [Member]
Changes in Carrying Amount (Fair Value) of Redeemable Non-Controlling Interests [Roll Forward]
Beginning balance	0
Operating results allocated to redeemable non-controlling interest partners	244
Distributions to redeemable non-controlling interest partners	(272)
Changes in the fair value of redeemable non-controlling interest	201
Purchases of businesses - initial equity related to redeemable non-controlling interest	13,883
Fair value of redeemable non-controlling interest - amended partnership agreements	88,516
Ending balance	102,572	0
Carrying Amount (Fair Value) of Redeemable Non-Controlling Interest [Abstract]
Contractual time period has lapsed but holder's employment has not been terminated			33,613
Contractual time period has not lapsed and holder's employment has not been terminated			72,700
Holder's employment has terminated and contractual time period has expired			0
Holder's employment has terminated and contractual time period has not expired			0
Redemption value prior to excess distributed earnings			106,313
Excess distributions over earnings and losses			(3,741)
Redeemable non-controlling interests	$ 0	$ 0	$ 102,572	$ 0

X

- Definition

Amount of Net Income (Loss) attributable to redeemable noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.19)
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Amount of increase in noncontrolling interest from sale of a portion of the parent's controlling interest.

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-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
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Amount of cash outflow to a noncontrolling interest. Includes, but not limited to, reduction of noncontrolling interest ownership. Excludes dividends paid to the noncontrolling interest.

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As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

+ References

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Redemption value, as if currently redeemable, of redeemable noncontrolling interest classified as temporary equity and the election has been made to accrete changes in redemption value to the earliest redemption date.

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Refers to amount of contractual time period had not lapsed and holder's employment had not been terminated as of balance sheet date.

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The distributions during the period for redemption of mandatorily redeemable noncontrolling interests.

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Refers to distributions in excess of earnings and undistributed (loss) earnings.

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Refers to the amount of increase due to revaluation fair value of redeemable non-controlling interest from sale of a portion of the parent's controlling interest.

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