Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Property and equipment, accumulated depreciation and amortization	$ 344,727	$ 327,102
Intangible assets, accumulated amortization (in dollars)	$ 33,774	$ 175,730
Special preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Special preferred stock, shares issued	3	3
Special preferred stock, shares outstanding	3	3
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares issued	54,007,425	52,423,085
Common stock, shares outstanding	54,007,425	52,423,085