Derivative Financial Instruments (Interest Rate Cap Derivative Summary) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)
Total Interest Rate Cap
Interest Rate Cap Derivative Summary [Line Items]
Derivative, notional amount	$ 190,000
Fair Value	$ 12
Designated as hedging instrument | Cash flow hedging | Interest Rate Cap $50 million Notional September 2017 Maturity
Interest Rate Cap Derivative Summary [Line Items]
Derivative, maturity date	Sep. 15, 2017
Derivative, notional amount	$ 50,000
Fair Value	$ 6
Designated as hedging instrument | Cash flow hedging | Interest Rate Cap $40 million Notional September 2017 Maturity
Interest Rate Cap Derivative Summary [Line Items]
Derivative, maturity date	Sep. 30, 2017
Derivative, notional amount	$ 40,000
Fair Value	6
Designated as hedging instrument | Cash flow hedging | Total Interest Rate Cap
Interest Rate Cap Derivative Summary [Line Items]
Derivative, notional amount	90,000
Fair Value	$ 12
Not designed as hedging instrument | Interest Rate Cap $100 million Notional March 2017 Maturity
Interest Rate Cap Derivative Summary [Line Items]
Derivative, maturity date	Mar. 21, 2017
Derivative, notional amount	$ 100,000
Fair Value	$ 0