Schedule II Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Valuation and Qualifying Accounts [Abstract]
Balance at Beginning of Year	$ 2,935	[1]	$ 2,524	[1]	$ 2,415	[1]
Charged to Expense	2,317	[1]	1,456	[1]	1,525	[1]
Charged to Other Accounts	0	[1],[2]	475	[1],[2]	0	[1],[2]
Write-offs, Net of Recoveries	1,855	[1]	1,520	[1]	1,416	[1]
Balance at End of Year	$ 3,397	[1]	$ 2,935	[1]	$ 2,524	[1]

[1] Additions to the allowance for doubtful accounts are charged to bad debt expense.

[2] Amounts represent opening balances from acquired businesses.