Gain on Sale of Asset (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Gain on Sale of Asset [Abstract]
Gain on the sale of an office building	$ 4,680	$ 4,680	$ 0	$ 0
Approximate proceeds from sale of office building		1,900
Approximate secured note received from sale of office building		$ 3,200