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 $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation:
Beginning balance	$ 17,495
(Gains) or losses included in earnings	(6,114)	[1]
Goodwill, Translation and Purchase Accounting Adjustments	0	[1]
Foreign currency translation adjustments	(194)	[2]
Business acquisitions	7,288
Settlements	(2,977)
Ending balance	15,498
The amount of total (gains) or losses for the year included in earnings or changes to net assets, attributable to changes in unrealized (gains) or losses relating to assets or liabilities still held at year-end.	$ (6,159)

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

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