Schedule II - Valuation and Qualifying Accounts Schedule II - Valuation and Qualifying Accounts (Details) (Allowance for Doubtful Accounts Receivable [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Doubtful Accounts Receivable [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	$ 1,049	$ 1,157	$ 1,719
Provision for doubtful accounts	1,600	1,147	442
Write-off of accounts receivable against allowance	(1,022)	(1,276)	(1,004)
Other	(8)	21	0
Ending balance	$ 1,619	$ 1,049	$ 1,157