Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Accounts and other receivables, allowance for uncollectible accounts	$ 2,213	$ 2,203
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	55,787,000	55,346,000
Common stock, shares outstanding	55,787,000	55,346,000