Acquisitions (Details 2) (USD $) In Thousands, unless otherwise specified			6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Business Acquisition
Consideration paid for acquisitions
Fair Value of Previously Held Equity Interests			$ 794
Cash Paid (gross of cash acquired)			48,667
Total Consideration			49,461
Fair Value of Identifiable Assets Acquired:
Cash, Accounts Receivable, Prepaid Expenses, Deferred Income Taxes and Other			5,843
Property, Plant and Equipment			13,682
Customer Relationship Assets			24,017
Other Assets			615
Liabilities Assumed and Deferred Income Taxes			(28,895)
Total Fair Value of Identifiable Net Assets Acquired			15,262
Goodwill Initially Recorded	2,473,336	2,463,352	34,199
Net cash acquired			(1,296)
Contingent and other payments related to acquisitions made in previous years			$ (1,005)