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Operations and Summary of Significant Accounting Policies and Estimates Summary of Changes in Allowance for Doubtful Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Changes in Allowance For Doubtful Accounts [Abstract]
Allowance for Doubtful Accounts Receivable, Current	$ 4,589	$ 6,796	$ 3,440	$ 1,975
Provision for Doubtful Accounts	1,705	4,806	1,814
Allowance for Doubtful Accounts Receivable, Charge-offs	$ (3,912)	$ (1,450)	$ (349)

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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