Business Segments and Geographic Information (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Pre-Tax Income Reconciliation of Segments
Total operating income from segments	$ 77,072	$ 73,299
Unallocated Amount:
General and Administrative Expenses	(28,502)	(32,040)
Net Interest Expense	(19,920)	(18,157)
Income before income taxes and equity in earnings of affiliates	$ 28,650	$ 23,102