Employee Benefit Plans (Details 4) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Non-Employee Director Compensation
Compensation cost	$ 4,200,000	$ 2,200,000	$ 2,000,000
Non Employee Director Member
Non-Employee Director Compensation
Granted (in shares)	71,311
Compensation cost	331,000
401(k) Savings & Retirement Plan
401(K) Savings & Retirement Plan
Percent of salary employee is permitted to contribute	100.00%
Vesting period	3 years
Common stock, shares issued	74,863	1,319,914	403,579
Total expense (including issuance of shares)	$ 367,000	$ 371,000	$ 436,000