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Leases (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Leases [Abstract]
Rental expense	$ 13,900,000	$ 13,800,000	$ 14,000,000
Operating leases minimum payments due [Abstract]
2014	12,763,000
2015	11,985,000
2016	9,776,000
2017	6,507,000
2018	5,091,000
Thereafter	5,865,000
Total minimum lease payments	$ 51,987,000

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