Fair Value Measurements - Fair Value of Other Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Borrowings under revolving credit facility	$ 17,796	$ 16,272
Carrying Value [Member] | Term loan [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt	39,113	45,833
Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Borrowings under revolving credit facility	17,796	16,272
Fair Value [Member] | Term loan [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt	$ 39,113	$ 45,833