Incentive Plan (Tables)

12 Months Ended

Dec. 31, 2011

Incentive Plan [Abstract]

Summary Of Stock Options

	Number of Options Granted			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (Years)		Aggregate Instrinsic Value (000's)
Non-statutory stock options:
Outstanding, beginning of period		1,414,450		$	11.44
Options granted		—		$	—
Options forfeited		(5,000	)	$	6.98
Options exercised		(616,000	)	$	7.36
Options expired		(6,000	)	$	26.84
Outstanding, end of period		787,450		$	14.55		3.47	$	5,988
Exercisable, end of period		764,450		$	14.30		3.42	$	5,988
Vested or expected to vest, end of period		787,450		$	14.55		3.47	$	5,988

Summary Of Non-Vested Shares

Nonvested Shares	Number of Shares			Weighted Average Grant Date Fair Value Per Share
Nonvested at beginning of period		1,802,573		$	11.06
Granted during period		686,600			19.48
Vested during period		(343,785	)		13.48
Forfeited during period		(183,217	)		12.87
Nonvested at end of period		1,962,171		$	13.41