Business Segments and Geographic Information (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Pre-Tax Income Reconciliation of Segments
Total operating income from segments	$ 91,605	$ 72,051	$ 257,714	$ 224,100
Unallocated Amount:
General and Administrative Expenses	(28,287)	(27,222)	(84,937)	(86,625)
Net Interest Expense	(20,360)	(20,485)	(60,058)	(58,580)
Loss on extinguishment of debt	0	(1,451)	0	(6,978)
Income before income taxes and equity in earnings of affiliates	$ 42,958	$ 22,893	$ 112,719	$ 71,917