Annual report pursuant to Section 13 and 15(d)

Fair Value Measurement - Fair Value and Carrying Value of Long-term Debt (Details)

v3.6.0.2
Fair Value Measurement - Fair Value and Carrying Value of Long-term Debt (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impairment of goodwill $ 0 $ 0
Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt value 145,746,000 108,323,000
Carrying Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt value $ 145,238,000 $ 107,148,000