Restricted Stock (Details) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended		6 Months Ended			12 Months Ended	0 Months Ended
	May 31, 2014	May 31, 2013	Jun. 30, 2014	Jun. 30, 2014 Restricted Stock Units (RSUs) [Member]	Jun. 30, 2014 Restricted Stock Units (RSUs) [Member] Class B [Member] Outside Director [Member]	Dec. 31, 2013 Restricted Stock Units (RSUs) [Member] Class B [Member] Outside Director [Member]	Feb. 04, 2014 Restricted Stock Units (RSUs) [Member] Class B [Member] Executives [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares distribution period from grant date			1 year
Total value of shares issued					$ 440	$ 440	$ 1,088
Shares issued (in shares)							45,678
Value of each share issued (in dollars per share)	$ 25.53	$ 24.30					$ 23.81
Summary of stock Issuances [Abstract]
Shares granted (in shares)	17,237	18,106
Vesting Date	May 08, 2015	May 07, 2014
Service Period	7/1/2014 - 6/30/2015	7/1/2013 - 6/30/2014
Period restricted stocks will vest ratably from date of grant				3 years