Lease Obligations (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Lease Obligations [Abstract]
Lease Expiration Date	Dec. 31, 2033
Rent expense	$ 7,400,000	$ 8,500,000	$ 7,500,000
2014 minimum rental payment	10,997,000
2015 minimum rental payment	8,171,000
2016 minimum rental payment	6,883,000
2017 minimum rental payment	5,803,000
2018 minimum rental payment	4,811,000
Minimum rental payment thereafter	48,722,000
Total minimum rental payment	$ 85,387,000