Fair Value Measurements - Fair Value of Other Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Borrowings under revolving credit facility	$ 13,925	$ 16,272
Carrying Value [Member] | Term loan [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt	41,048	45,833
Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Borrowings under revolving credit facility	13,925	16,272
Fair Value [Member] | Term loan [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt	$ 41,048	$ 45,833