Fair Value Measurements - Fair Value of Other Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Borrowings under revolving credit facility	$ 23,189	$ 8,500
Carrying Value [Member] | Term loan [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt	28,970	35,541
Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Borrowings under revolving credit facility	23,189	8,500
Fair Value [Member] | Term loan [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt	$ 28,970	$ 35,541