Shareholders' Equity Shareholders' Equity (Tables)

6 Months Ended

Jun. 30, 2015

Schedule of Share-Based Compensation Expense [Abstract]

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

The Company recognized the following stock-based compensation expense, net for the periods indicated which is reflected as general and administrative expense in the consolidated statements of operations:

	Three Months Ended June 30,						Six Months Ended June 30,
	2015			2014			2015			2014
	(In thousands)
Stock appreciation rights		($49	)		$11,116			$5,891			$19,572
Restricted stock awards and units	6,014			8,224			11,229			13,925
Performance share awards	496			319			765			333
	6,461			19,659			17,885			33,830
Less: amounts capitalized to proved and unproved properties	(1,518		)	(2,681		)	(3,089		)	(4,691		)
Total stock-based compensation expense, net		$4,943			$16,978			$14,796			$29,139
Income tax benefit		$1,731			$5,943			$5,179			$10,199