Fair Value Measurements - Fair Value of Other Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Carrying Value
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Borrowings under revolving credit facility	$ 40,589	$ 38,566
Carrying Value | Term loan
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Term loan	0	9,833
Fair Value
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Borrowings under revolving credit facility	40,589	38,566
Fair Value | Term loan
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Term loan	$ 0	$ 9,833