Goodwill and Intangible Assets - Finite-lived Intangible Assets Roll Forward (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Mar. 31, 2014	Sep. 30, 2012	Dec. 31, 2013	Dec. 31, 2012
Finite-lived Intangible Assets, Gross [Roll Forward]
Intangible assets, January 1	$ 7,602	$ 7,602		$ 7,602
Additions	0	0
Total intangible assets, end of period		7,602		7,602
Accumulated Amortization [Roll Forward]
Accumulated amortization	(7,432)	(6,975)		(7,404)
Current year amortization	(28)	(124)
Total accumulated amortization		(7,099)		(7,404)
Net intangible assets, end of period		$ 503	$ 170