Consolidated Balance Sheets (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Mar. 21, 2013	Dec. 31, 2012
Assets
Accumulated depreciation	$ 151,078		$ 129,479
Stockholders’ equity
Preferred stock, par value	$ 0.01		$ 0.01
Preferred stock, shares authorized	10,000,000		10,000,000
Preferred stock, shares issued	5,750,000	5,800,000	0
Preferred stock, shares outstanding	0		0
Common stock, par value	$ 0.01		$ 0.01
Common stock, shares authorized	125,000,000		125,000,000
Common stock, shares issued	38,788,745		37,099,202
Common stock, shares outstanding	38,788,745		37,099,202