Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=6505113

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Earnings Per Share and Dividends - Additional Information (Details) - USD ($)														12 Months Ended
	Feb. 22, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 23, 2016	Nov. 27, 2015	Sep. 03, 2015	Jun. 02, 2015	Apr. 08, 2015	Dec. 04, 2014	Sep. 03, 2014	Jun. 05, 2014	Apr. 18, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Dividends Payable [Line Items]
Anti-dilutive shares														0	0	0
Cash dividends declared per share of Class A common stock		$ 0.1500	$ 0.1500	$ 0.1500	$ 0.1500	$ 0.1250	$ 0.1250	$ 0.1250	$ 1.6250	$ 0.0625	$ 0.0625	$ 0.0625	$ 0.0625	$ 0.60	$ 2.00	$ 0.25
Dividends declared and paid														$ 10,578,000	$ 24,003,000	$ 2,901,000
Common Class A
Dividends Payable [Line Items]
Dividends declared and paid														$ 10,578,000	$ 24,003,000	$ 2,901,000
Common Class B
Dividends Payable [Line Items]
Common stock, shares outstanding		1												1
Quarterly dividend \| Common Class A
Dividends Payable [Line Items]
Cash dividends declared per share of Class A common stock	$ 0.18