Allocation of Plan Assets (Details) (USD $) In Thousands, unless otherwise specified					12 Months Ended
	Dec. 31, 2012	Jun. 12, 2012	Dec. 31, 2012 PBP	Jun. 12, 2012 PBP	Dec. 31, 2012 PBP Interest-bearing cash	Dec. 31, 2012 PBP Fixed income securities	Dec. 31, 2012 PBP Equity securities	Dec. 31, 2012 Pension Plan	Jun. 12, 2012 Pension Plan	Dec. 31, 2012 Pension Plan Level 1	Dec. 31, 2012 Pension Plan Level 2	Dec. 31, 2012 Pension Plan Level 3	Dec. 31, 2012 Pension Plan Interest-bearing cash	Dec. 31, 2012 Pension Plan Interest-bearing cash Level 1	Dec. 31, 2012 Pension Plan Interest-bearing cash Level 2	Dec. 31, 2012 Pension Plan Interest-bearing cash Level 3	Dec. 31, 2012 Pension Plan Fixed income securities	Dec. 31, 2012 Pension Plan Fixed income securities Level 1	Dec. 31, 2012 Pension Plan Fixed income securities Level 2	Dec. 31, 2012 Pension Plan Fixed income securities Level 3	Dec. 31, 2012 Pension Plan Equity securities	Dec. 31, 2012 Pension Plan Equity securities Level 1	Dec. 31, 2012 Pension Plan Equity securities Level 2	Dec. 31, 2012 Pension Plan Equity securities Level 3
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocation, minimum					5.00%	50.00%	20.00%
Target plan asset allocation, maximum					10.00%	80.00%	30.00%
Actual plan asset allocation					2.33%	74.34%	23.33%
Fair value of plan assets	$ 5,626	$ 5,379	$ 0	$ 0				$ 5,626	$ 5,379	$ 1,727	$ 3,899	$ 0	$ 130	$ 130	$ 0	$ 0	$ 4,190	$ 291	$ 3,899	$ 0	$ 1,306	$ 1,306	$ 0	$ 0