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, 2014		Dec. 31, 2013
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation:
Beginning balance	$ 14,420,000		$ 17,495,000
(Gains) or losses included in earnings	(7,533,000)	[1]	(10,253,000)	[1]
Foreign currency translation adjustments	(228,000)	[2]	730,000	[2]
Business acquisitions	6,441,000		9,425,000
Settlements	(2,250,000)		(2,977,000)
Ending balance	10,850,000		14,420,000
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.	$ (6,540,000)		$ (9,954,000)

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

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