Share-Based Compensation (Summary of Nonvested Share Activity) (Details) - $ / shares shares in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Number of Non-vested Shares
December 31, 2014 (in shares)	1,465
Granted (in shares)	561
Vested (in shares)	(486)
Forfeited (in shares)	(70)
September 30, 2015 (in shares)	1,470
Weighted Average Grant Date Fair Value
December 31, 2014 (in dollars per share)	$ 6.17
Granted (in dollars per share)	6.64	$ 8.24
Vested (in dollars per share)	5.17
Forfeited (in dollars per share)	6.66
September 30, 2015 (in dollars per share)	$ 6.66