Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Accounts Receivable (Details)

v3.7.0.1
Summary of Significant Accounting Policies - Accounts Receivable (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Activity regarding the allowance for doubtful accounts      
Balance, beginning of period $ 1,351 $ 2,273 $ 2,124
Amount charged to selling, general and administrative expenses 630 (803) 1,453
Charge-offs, net of recoveries (106) (119) (1,304)
Balance, end of period $ 1,875 $ 1,351 $ 2,273