Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance For Doubtful Accounts Receivable Rollforward [Line Items]
Allowance for Doubtful Accounts, Balance at Beginning of Period	$ 577	$ 794	$ 797
Charged to Costs and Expenses	293	134	526
Write Off of Uncollectible Accounts,Net of Recoveries	(292)	(351)	(529)
Allowance for Doubtful Accounts, Balance at End of Period	$ 578	$ 577	$ 794