Valuation And Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Allowance For Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 12,127		$ 11,301		$ 10,137
Charged to costs and expenses	1,420		7,157		7,563
Deductions	4,161	[1]	6,331	[1]	6,399	[1]
Balance at end of period	9,386		12,127		11,301
Tax Valuation Allowance [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	28,376		24,595		15,818
Charged to costs and expenses	2,243		3,781		10,823
Deductions	78	[1]	0	[1]	2,046	[1]
Balance at end of period	$ 30,541		$ 28,376		$ 24,595

[1] Write-offs of amounts previously reserved.