Earnings Per Share Basic Earnings Per Share (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Earnings Per Share, Basic, by Common Class [Line Items]
Net income (loss)	$ 38,944	$ 30,622	$ 75,020
Income attributable to participating securities	(1,068)	(608)	(1,552)
Net income available to common stockholders	$ 37,876	$ 30,014	$ 73,468