Commitments and Contingencies (Details) (Petrello)	3 Months Ended
	Mar. 31, 2013
Employment contracts
Initial term of the employment agreement	5 years
Automatic extension period	1 year
New term of the employment agreement	90 days
Employment benefit due to death or disability, payment period	30 days
Employment agreement termination without cause, benefit as a ratio to 3 year average base salary and bonus	2.99
Employment agreement termination without cause, benefit base period	3 years
TSR Shares
Employment contracts
Vesting period	3 years
Value of award that will vest as percentage of base salary	150.00%
Performance Shares
Employment contracts
Vesting period	3 years
Value of award that will vest as percentage of base salary	200.00%