Employee and Non-Employee Director Stock and Benefit Plans (Details 5) (USD $)	12 Months Ended					12 Months Ended										12 Months Ended						0 Months Ended
	Dec. 31, 2013 Restricted share awards	Dec. 31, 2012 Restricted share awards	Dec. 31, 2011 Restricted share awards	Dec. 31, 2013 Performance-based share awards	Dec. 31, 2013 Market-based share awards	Dec. 31, 2013 Performance-Based or Market-Based Restricted Stock Units	Dec. 31, 2012 Performance-Based or Market-Based Restricted Stock Units	Dec. 31, 2011 Performance-Based or Market-Based Restricted Stock Units	Dec. 31, 2013 Time-Based Restricted Stock Units	Dec. 31, 2012 Time-Based Restricted Stock Units	Dec. 31, 2011 Time-Based Restricted Stock Units	Dec. 31, 2013 Phantom share awards	Dec. 31, 2012 Phantom share awards	Dec. 31, 2011 Phantom share awards	Dec. 31, 2013 Market-based units	Dec. 31, 2013 2007 Plan Phantom share awards	Dec. 31, 2012 2007 Plan Phantom share awards	Dec. 31, 2011 2007 Plan Phantom share awards	Dec. 31, 2013 SUA Subplan	Dec. 31, 2012 SUA Subplan	Dec. 31, 2011 SUA Subplan	Jun. 30, 2003 SUA Subplan First amendment	Jan. 02, 2006 SUA Subplan Second amendment
Total Number of Shares
Outstanding at the beginning of the period (in shares)	3,061,335	3,055,304	2,935,323	45,668	413,075	677,831	792,058	982,881	2,383,504	2,263,246	1,952,442	695,710	397,747	259,370	74,207					71,580	364,167
Granted (in shares)	1,023,811	1,392,746	1,343,172			91,932	216,740	128,208	931,879	1,176,006	1,214,964	249,365	447,353	205,760					0
Vested (in shares)	(1,203,142)	(1,050,760)	(843,053)			(64,865)	(86,769)	(66,271)	(1,138,277)	(963,991)	(776,782)	(245,296)	(135,049)	(67,383)						(71,580)	(288,917)
Forfeited (in shares)	(443,777)	(335,955)	(380,138)			(246,155)	(244,198)	(252,760)	(197,622)	(91,757)	(127,378)	(28,017)	(14,341)								(3,670)
Outstanding at the end of the period (in shares)	2,438,227	3,061,335	3,055,304	45,668	413,075	458,743	677,831	792,058	1,979,484	2,383,504	2,263,246	671,762	695,710	397,747	74,207				0		71,580
Weighted Average Grant Date Fair Value
Outstanding at the beginning of the period (in dollars per share)	$ 13.25	$ 17.49	$ 19.44									$ 13.72	$ 18.47	$ 18.51						$ 33.95	$ 29.82
Granted (in dollars per share)	$ 12.00	$ 10.63	$ 16.65									$ 12.01	$ 11.33	$ 18.67					$ 0.00
Vested (in dollars per share)	$ 14.47	$ 17.99	$ 23.29									$ 14.52	$ 19.46	$ 19.21					$ 0.00	$ 33.95	$ 28.98
Forfeited (in dollars per share)	$ 12.20	$ 26.10	$ 16.71									$ 14.92	$ 17.21						$ 0.00		$ 15.40
Outstanding at the end of the period (in dollars per share)	$ 12.31	$ 13.25	$ 17.49									$ 12.74	$ 13.72	$ 18.47					$ 0.00		$ 33.95
Additional disclosures
Unrecognized compensation costs	$ 13,600,000											$ 6,900,000
Weighted average period over which unrecognized compensation costs are expected to be recognized	1 year 8 months 8 days											1 year 8 months 5 days
Grant date fair value	15,700,000
Tax shortfalls related to the vesting	1,200,000	4,000,000	2,200,000
Share-based compensation expense	13,000,000	12,400,000	20,600,000													7,300,000	2,600,000	1,100,000			(200,000)
Tax benefit related to share-based compensation expense	5,200,000	5,000,000	8,400,000													2,000,000	700,000	300,000			(100,000)
Common stock units to be issued as a percentage of cash compensation deferred																						130.00%	120.00%
Percentage of deferred compensation that is fully vested at all times and non-forfeitable																						100.00%	100.00%
Percentage of the deferred compensation representing the match that is contingent only on employment with the Company																						30.00%	20.00%
Percentage of deferred compensation representing the match that vests on third anniversary																						50.00%	100.00%
Percentage of deferred compensation representing the match that vests on sixth anniversary																						50.00%
Minimum cash compensation required to qualify for elective participation under the plan																						$ 200,000	$ 200,000