Share-Based Compensation and Non-Qualified Deferred Compensation Plan Share-Based Compensation and Non-Qualified Deferred Compensation Plan (NQDC diversified share awards rollforward) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Share-Based Compensation and Non-Qualified Deferred Compensation [Abstract]
Balance at December 31, 2014	$ 68,134
Change in classification	(1,024)
Change in redemption value	3,764
Diversification of share awards	(3,020)
Balance at March 31, 2015	$ 69,902