Restricted Stock (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended	9 Months Ended	12 Months Ended
	Feb. 04, 2015	Sep. 30, 2015	Sep. 30, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares distribution period from grant date			1 year
5/8/2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of each share issued (in dollars per share)		$ 25.53
Summary of stock Issuances [Abstract]
Shares granted (in shares)		17,237
Vesting date		May 08, 2015
5/12/2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of each share issued (in dollars per share)		$ 22.59
Summary of stock Issuances [Abstract]
Shares granted (in shares)		21,252
Vesting date		May 12, 2016
Restricted Stock Units (RSUs) [Member]
Summary of stock Issuances [Abstract]
Period restricted stocks will vest ratably from date of grant			3 years
Restricted Stock Units (RSUs) [Member] | Class B [Member] | Outside Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total value of shares issued			$ 480	$ 440
Restricted Stock Units (RSUs) [Member] | Class B [Member] | Executives [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total value of shares issued	$ 853
Shares issued (in shares)	36,646
Value of each share issued (in dollars per share)	$ 23.29