Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Details)

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Summary of Significant Accounting Policies (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Changes in allowance for doubtful accounts      
Balance beginning of year $ 1,436 $ 1,815 $ 250
Charged to expense 7,342 5,860 5,484
Write-offs and other (6,841) (6,239) (3,919)
Balance end of year $ 1,937 $ 1,436 $ 1,815