Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2013

Fair Value Disclosures [Abstract]

Assets Measured at Fair Value on a Recurring Basis

			Fair Value Measurements Using
Description	December 31, 2012		Quoted Prices for Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total (Losses)
Credit facility borrowings	$	2,800	$	—	$	2,800	$	—	$	—

			Fair Value Measurements Using
Description	March 31, 2013		Quoted Prices for Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total (Losses)
Credit facility borrowings	$	2,800	$	—	$	2,800	$	—	$	—

			Fair Value Measurements Using
Description	December 31, 2012		Quoted Prices for Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total (Losses)
	(in thousands)
Cash and cash equivalents	$	40,315	$	40,315	$	—	$	—	$	—

			Fair Value Measurements Using
Description	March 31, 2013		Quoted Prices for Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total (Losses)
	(in thousands)
Cash and cash equivalents	$	40,297	$	40,297	$	—	$	—	$	—