Goodwill and Intangible Assets (Schedule of Indefinite-Lived Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Trade Names (Amortizable) [Member]
Indefinite-lived intangible assets
Cost	$ 117,600	$ 117,600
Accumulated impairment charge	(67,190)	(67,190)
Carrying value	50,410	50,410
Contractor License [Member]
Indefinite-lived intangible assets
Cost	6,000	6,000
Accumulated impairment charge	$ (6,000)	$ (6,000)