Mezzanine Equity (Narrative) (Details) - USD ($)	1 Months Ended	3 Months Ended					6 Months Ended
	Mar. 31, 2013	May 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2017	Jun. 30, 2017	May 31, 2019	Jun. 30, 2018	Nov. 30, 2018
Purchase Requirement [Line Items]
Redeemable noncontrolling interests		$ 18,900,000					$ 18,900,000		$ 19,800,000
Mandatorily redeemable convertible preferred shares redemption value		$ 125,000,000					$ 125,000,000		$ 125,000,000
Dividends per common share (in dollars per share)		$ 0.125	$ 0.125	$ 0.1	$ 0.10	$ 0.0625	$ 0.25	$ 0.2
Preferred stock dividend		$ 1,276,000		$ 1,171,000			$ 2,552,000	$ 2,343,000
3.25% Cumulative Convertible Preferred Shares
Purchase Requirement [Line Items]
Dividend rate on preferred stock	3.25%						3.25%
Mandatorily redeemable convertible preferred shares redemption value		$ 125,000,000.0					$ 125,000,000.0
Mandatorily redeemable preferred stock, number of shares in conversion		4,162,200					4,162,200
Mandatorily redeemable preferred stock, effective conversion price per share (in dollars per share)		$ 30.03					$ 30.03
Minimum dividend considered for additional quarterly payments (in dollars per share)		0.0625					$ 0.0625
Preferred stock dividend							$ 2,600,000	$ 2,300,000
Mandatorily redeemable preferred shares callable price per share (in dollars per share)		$ 1,000					$ 1,000