Description of Business and Summary of Significant Accounting Policies (Assets and Liabilities Measured at Fair Value on a Recurring Basis using Significant Unobservable Inputs) (Details) - USD ($)		9 Months Ended	12 Months Ended
		Sep. 30, 2015	Dec. 31, 2014
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation:
Beginning balance		$ 5,367,000	$ 14,420,000
(Gains) or losses included in earnings	[1]	(1,533,000)	(10,237,000)
Goodwill, Translation and Purchase Accounting Adjustments	[1]	(2,000,000)
Foreign currency translation adjustments	[2]	(47,000)	(314,000)
Business acquisitions		6,226,000	4,312,000
Settlements		0	(2,814,000)
Ending balance		8,013,000	5,367,000
The amount of total (gains) or losses for the period included in earnings or changes to net assets, attributable to changes in unrealized (gains) or losses relating to assets or liabilities still held at period-end.		$ (1,533,000)	$ (8,911,000)

[1] Recorded as an adjustment to reported general and administrative expenses

[2] Recorded as a component of other comprehensive income within stockholders' equity