Derivative Financial Instruments (Narrative) (Details)			3 Months Ended
	Sep. 30, 2016 USD ($) shares	Feb. 05, 2016 USD ($) shares	Sep. 30, 2016 USD ($) shares	Dec. 31, 2015 USD ($)	Jun. 30, 2015 USD ($)
Derivative [Line Items]
Cash pledged as collateral	$ 7,600,000		$ 7,600,000	$ 5,300,000
Number of shares to be issued upon conversion | shares	20,477	73,394
Amount of debt converted			1,400,000
Not Designated as Hedging Instrument
Derivative [Line Items]
Cash pledged as collateral	$ 768,000,000		$ 768,000,000	0
Common Stock
Derivative [Line Items]
Number of shares issued in debt conversion (in shares) | shares			52,917
Other liabilities
Derivative [Line Items]
Derivative, notional amount		$ 2,000,000
Fair Value Hedging | Interest Rate Swap
Derivative [Line Items]
Derivative, fixed interest rate					3.40%
Derivative, basis spread on LIBOR (as a percent)					0.88%
Derivative, notional amount					$ 13,800,000
Cash pledged as collateral	6,700,000		$ 6,700,000
Back-to-back Loan Swaps | Interest Rate Swap
Derivative [Line Items]
Cash pledged as collateral	$ 3,600,000		$ 3,600,000	$ 0