Stockholders' Equity (Repurchased Shares and Average Share Price) (Details) (USD $)	12 Months Ended			40 Months Ended	2 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2014
Ninth Plan
Class of Stock [Line Items]
Repurchased shares	0	0	389,627	590,832
Stock repurchase average share price (in usd per share)	$ 0.00	$ 0.00	$ 13.45	$ 12.83
Tenth Plan
Class of Stock [Line Items]
Repurchased shares	108,075	544,000	52,900	704,975
Stock repurchase average share price (in usd per share)	$ 16.68	$ 15.88	$ 13.88	$ 15.85
Eleventh Plan
Class of Stock [Line Items]
Repurchased shares	0	0	0		0
Stock repurchase average share price (in usd per share)	$ 0.00	$ 0.00	$ 0.00		$ 0.00