Acquisitions (Details 2) (USD $) In Thousands, unless otherwise specified			3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Business Acquisition
Consideration paid for acquisitions
Cash Paid (gross of cash acquired)			$ 32,081
Total Consideration			32,081
Fair Value of Identifiable Assets Acquired:
Cash, Accounts Receivable, Prepaid Expenses, Deferred Income Taxes and Other			3,177
Property, Plant and Equipment			5,317
Customer Relationship Assets			14,376
Other Assets			34
Liabilities Assumed and Deferred Income Taxes			(14,794)
Total Fair Value of Identifiable Net Assets Acquired			8,110
Goodwill Initially Recorded	2,466,001	2,463,352	23,971
Net cash acquired			(1,595)
Contingent and other payments related to acquisitions made in previous years			$ 295