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Amount of assets held-for-sale that are not part of a disposal group.

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Costs incurred to effect a business combination which have been expensed during the period. Such costs could include business integration costs, systems integration and conversion costs, and severance and other employee-related costs.

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Amount of assets acquired at the acquisition date.

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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Acquisitions (Details)					3 Months Ended		9 Months Ended
Acquisitions (Details)	Jul. 14, 2017 USD ($)	Jan. 01, 2017 USD ($)	Jun. 18, 2016 USD ($)	Jan. 05, 2016 USD ($) customer	Sep. 29, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 29, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 30, 2016 USD ($)
Acquisitions
Revenues					$ 194,302,000	$ 160,421,000	$ 596,347,000	$ 470,114,000
Operating income					7,587,000	11,109,000	25,133,000	28,553,000
Approximate fair value estimates of the assets acquired and liabilities assumed
Goodwill					390,552,000		390,552,000		$ 305,476,000
Assets held for sale					3,800,000		3,800,000
Sellers Notes					12,761,000		12,761,000		$ 12,500,000
LTS
Approximate fair value estimates of the assets acquired and liabilities assumed
Interest acquired (as a percent)				100.00%
Concentrations (as a percent)				74.00%
Number of customers \| customer				2
Purchase price				$ 37,000,000
Bayonne
Approximate fair value estimates of the assets acquired and liabilities assumed
Purchase price				$ 4,100,000
The Wisconsin acquisition
Approximate fair value estimates of the assets acquired and liabilities assumed
Accounts receivable			$ 0
Purchase price			$ 6,100,000
Community Health Systems Inc.
Acquisitions
Revenues							145,800,000	138,800,000
Operating income							24,000,000	9,800,000
Deal and transition costs incurred							4,500,000
Approximate fair value estimates of the assets acquired and liabilities assumed
Accounts receivable					21,444,000		21,444,000
Prepaids and other assets					705,000		705,000
Property, plant & equipment					7,301,000		7,301,000
Goodwill					84,213,000		84,213,000
Intangibles					61,570,000		61,570,000
Assets acquired					175,233,000		175,233,000
Liabilities assumed					(14,262,000)		(14,262,000)
Non-controlling interest					(32,042,000)		(32,042,000)
Net assets acquired					128,929,000		128,929,000
Interest acquired (as a percent)		80.00%
Purchase price	$ 1,200,000	$ 128,900,000
Sellers Notes	$ 300,000
Healthcare Innovations
Acquisitions
Revenues					6,490,000	$ 10,308,000	16,890,000	$ 20,344,000
Approximate fair value estimates of the assets acquired and liabilities assumed
Goodwill					$ 36,649,000		$ 36,649,000
Interest acquired (as a percent)					72.00%	61.50%	72.00%	61.50%