Valuation And Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance For Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	$ 8,133	$ 4,317	$ 3,019
Additions charged/(credited) to expense	8,699	4,961	3,039
Charged to other accounts	(206)	(941)	(541)
Deductions	(6,326)	(204)	(1,200)
Balance at end of year	10,300	8,133	4,317
Deferred Income Tax Asset Allowance Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year			8,781	[1]
Additions charged/(credited) to expense			11,146	[1]
Deductions			$ (19,927)	[1]

[1] Additions represent increases in valuation allowances against deferred tax assets. Deductions represent decreases in valuation allowances against deferred tax assets