Condensed Consolidated Balance Sheets (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Mar. 21, 2013
Assets
Accumulated depreciation	$ 169,763	$ 151,078
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	5,750,000	5,800,000
Preferred stock, shares outstanding	5,750,000	5,750,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	125,000,000	125,000,000
Common stock, shares issued	47,263,151	38,788,745
Common stock, shares outstanding	47,263,151	38,788,745