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Corporate Office Relocation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended	15 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2012
Corporate Office Relocation (Textual) [Abstract]
Personnel and office relocation expenses incurred to date		$ 83	$ 1,810
Expected amount of personnel and office relocation expenses	13,200
Estimated loss on lease range, minimum	6,000
Estimated loss on lease range, maximum	$ 8,000

Amount of costs incurred to date for the specified type of restructuring cost.

Amount expected to be charged against earnings in the current and future periods for the specified restructuring cost.