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Summary of Significant Accounting Policies (Allowance for Doubtful Accounts) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Changes in the allowance for doubtful accounts
Balance, beginning of year	$ 714	$ 571	$ 262
Charged to provision for doubtful accounts	570	512	661
Write-offs	(412)	(369)	(352)
Balance, end of year	$ 872	$ 714	$ 571

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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