Deferred Revenue (Tables)

12 Months Ended

Dec. 31, 2013

Revenue Recognition [Abstract]

Components of Deferred Revenue

The components of deferred revenue consist of the following (in thousands):

	December 31,
	2013		2012
Future service	$	25,102	$	25,074
Estimated potential penalties and holdbacks		9,923		9,209
	$	35,025	$	34,283