Schedule II - Valuation And Qualifying Accounts (Details) (Allowance for Doubtful Accounts, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Allowance for Doubtful Accounts
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 3,675		$ 2,780		$ 1,230
Charged to Costs and Expenses	1,244	[1]	2,103	[1]	1,792	[1]
Charged to Other Accounts		[2]		[2]		[2]
Deductions	(2,887)	[3]	(1,208)	[3]	(242)	[3]
Balance at End of Period	$ 2,032		$ 3,675		$ 2,780

[1] Charges relate to provisions for doubtful accounts

[2] Reflects the impact of acquisitions

[3] Deductions relate to the write-off of accounts receivable deemed uncollectible