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Acquisitions (Narrative) (Details) (USD $)			0 Months Ended	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013 September 2013 Acquisition	Sep. 30, 2014 September 2013 Acquisition	Sep. 30, 2013 September 2013 Acquisition	Sep. 30, 2014 September 2013 Acquisition	Sep. 30, 2013 September 2013 Acquisition	Sep. 30, 2014 Selling, general and administrative costs September 2013 Acquisition	Sep. 30, 2013 Selling, general and administrative costs September 2013 Acquisition	Sep. 30, 2014 Selling, general and administrative costs September 2013 Acquisition	Sep. 30, 2013 Selling, general and administrative costs September 2013 Acquisition	Sep. 30, 2014 Interest Expense September 2013 Acquisition	Sep. 30, 2014 Interest Expense September 2013 Acquisition
Business Acquisition [Line Items]
Total acquisition related costs				$ (781,000)	$ 145,000	$ (1,315,000)	$ 468,000	$ (781,000)	$ 76,000	$ (1,521,000)	$ 196,000
Aggregate purchase consideration					7,454,000		7,454,000
Fair value of business acquisition obligation			2,322,000			410,000
Adjustment to payable, expense recorded								781,000		1,523,000		(16,000)	(69,000)
Goodwill	$ 340,882,000	$ 341,174,000		$ 2,466,000	$ 2,466,000	$ 2,466,000	$ 2,466,000

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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The expenses and losses recorded for each transaction with the acquiree that was recognized separately from the acquisition of assets and assumptions of liabilities in the business combination.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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