Annual report pursuant to Section 13 and 15(d)

Receivables and Allowance for Doubtful Receivables (Allowance for Doubtful Receivables Rollforward) (Details)

v3.3.1.900
Receivables and Allowance for Doubtful Receivables (Allowance for Doubtful Receivables Rollforward) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Balance at beginning of year $ 4,542 $ 2,346 $ 3,215
Charged to costs and expenses 6,359 3,994 2,370
Charged to other accounts 0 0 (446)
Write-offs net of recoveries 7,271 1,798 2,793
Balance at end of year $ 3,630 $ 4,542 $ 2,346