W&T Offshore, Inc. Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Schedule of Fair Value of Derivatives Financial Instruments and Long-Term Senior Notes (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative assets		$ 141
Derivative liabilities		9,423
Fair Value, Inputs, Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative assets		141
8.50% Senior Notes	594,000	962,460
Derivative liabilities		9,423
Revolving bank credit facility	$ 447,000	$ 290,000