Fair Value Measurement - Assets and Liabilities Measured at Fair Value (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
Recurring Measurements
Assets and liabilities that are measured at fair value on a recurring basis
Cash equivalents	$ 10,000		$ 30,000
Level 1 | Recurring Measurements
Assets and liabilities that are measured at fair value on a recurring basis
Cash equivalents	10,000		30,000
Level 2 | Recurring Measurements
Assets and liabilities that are measured at fair value on a recurring basis
Cash equivalents	0		0
Level 3 | Recurring Measurements
Assets and liabilities that are measured at fair value on a recurring basis
Cash equivalents	0		0
Interest rate swaps
Assets and liabilities that are measured at fair value on a recurring basis
Interest rate swap	(785)	[1]	(723)	[1]
Interest rate swaps | Recurring Measurements
Assets and liabilities that are measured at fair value on a recurring basis
Interest rate swap	(785)		(723)
Interest rate swaps | Level 1 | Recurring Measurements
Assets and liabilities that are measured at fair value on a recurring basis
Interest rate swap	0		0
Interest rate swaps | Level 2 | Recurring Measurements
Assets and liabilities that are measured at fair value on a recurring basis
Interest rate swap	(785)		(723)
Interest rate swaps | Level 3 | Recurring Measurements
Assets and liabilities that are measured at fair value on a recurring basis
Interest rate swap	$ 0		$ 0

[1] (1) Balance recorded as other liabilities in Condensed Consolidated Balance Sheet