Share Based and Deferred Compensation (Details Textuals) (USD $)	12 Months Ended									3 Months Ended		9 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Stock Option [Member]	Dec. 31, 2012 Stock Option [Member]	Dec. 31, 2011 Stock Option [Member]	Dec. 31, 2013 Restricted Share Awards [Member]	Dec. 31, 2012 Restricted Share Awards [Member]	Dec. 31, 2011 Restricted Share Awards [Member]	Dec. 31, 2013 Restricted Performance Share Units Plan [Member] Employees	Dec. 31, 2012 Restricted Performance Share Units Plan [Member]	Sep. 30, 2011 Restricted Performance Share Units Plan [Member]	Dec. 31, 2013 Restricted Performance Share Units Plan [Member] Age Employees	Dec. 31, 2012 Restricted Performance Share Units Plan [Member]	Dec. 31, 2011 Restricted Performance Share Units Plan [Member]	Dec. 31, 2013 Employee Share Purchase Plan [Member]	Dec. 31, 2012 Employee Share Purchase Plan [Member]	Dec. 31, 2011 Employee Share Purchase Plan [Member]	Dec. 31, 2013 Deferred Compensation Plan [Member]	Dec. 31, 2012 Deferred Compensation Plan [Member]	Dec. 31, 2011 Deferred Compensation Plan [Member]	Dec. 31, 2013 Executive Officer [Member] Restricted Share Awards [Member]	Feb. 25, 2013 Executive Officer [Member] Restricted Share Awards [Member]	Feb. 25, 2013 Executive Officer [Member] Restricted Performance Share Units Plan [Member]	Mar. 01, 2012 Executive Officer [Member] Restricted Performance Share Units Plan [Member]	Mar. 02, 2011 Executive Officer [Member] Restricted Performance Share Units Plan [Member]
Share Based and Deferred Compensation (Textuals) [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	2,983,569.000	3,337,549		2,983,569
Unrecognized compensation expenses				$ 100,000			$ 1,900,000
Weighted average period over which options will be recognized				0 years 2 months 20 days			1 year 1 month 21 days
Stock-based compensation expense, capitalized	1,400,000	2,600,000	1,500,000	100,000	500,000	400,000	600,000	900,000	700,000	800,000			1,200,000		500,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number							563,713	597,708
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period							three to seven years from the initial grant date
Award vesting term, minimum	1 year						3 years
Award vesting term, maximum	10 years						7 years
Stock-based compensation expense	8,300,000	8,600,000	6,400,000	700,000	1,600,000	1,400,000	3,200,000	3,400,000	3,200,000	4,400,000	1,700,000		3,500,000			100,000	100,000	100,000
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date																15.00%
Vesting Period, Minimum	3 years												3 years
Aggregate share-based awards awarded to executives																1,250,000							157,208	231,093	242,122	113,256
Stock Issued During Period, Value, Employee Stock Purchase Plan																300,000	400,000
Share-based Compensation Arrangement by Share-based Payment Award, Cliff Vesting, Minimum							3 years
Voluntary termination of employment terms							after reaching age 57 and accumulating at least 15 years of service with the Company						after reaching age 57 and accumulating at least 15 years of service with the Company
Age limit of voluntary termination of employment													57									57
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	236,318
Accumulated Service Period For Voluntary Termination							15 years						15 years
Maximum percentage of the participant's base units													200.00%
Fair value of awards on the grant date												2,000,000	4,100,000	4,100,000
Number of executives with employment agreements										2			2
Share purchases made by employees under ESPP																85% of the average closing price per share for a specified period
Share purchases made by employees under ESPP, Percentage																		85.00%
Percentage of plan contribution																20.00%
Amount of participant contribution																50,000
Deferred Compensation Arrangement With Individual Decrease In Compensation Expense																			200,000		100,000
Deferred compensation arrangement with individual increase in compensation expense.																				300,000
Number of shares to be issued under deferred compensation plan included in total shares outstanding																			300,000	300,000
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 400,000