Derivatives and Hedging Activities - Narrative (Details)	1 Months Ended		12 Months Ended
	Feb. 28, 2014 USD ($)	Jan. 31, 2014 USD ($)	Dec. 31, 2016 USD ($) swap_agreement	Dec. 31, 2015 USD ($)
Interest Rate Swap [Member]
Derivative [Line Items]
Amount of loss related to change in fair value and other ineffectiveness			$ 300,000	$ 1,500,000
Fair value interest rate derivatives			4,300,000
Aggregate termination value had provisions been breached			4,300,000
Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Reclassified from AOCI into interest expense			5,500,000
Gain in earnings related to ineffective portion			2,500,000
Loss on derivative instruments			3,300,000
Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Interest Expense [Member]
Derivative [Line Items]
Derivative gain (loss) to be reclassified during next 12 months			$ (800,000)
Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Credit Facility Term Loan [Member] | Line of Credit [Member]
Derivative [Line Items]
Number of interest rate swaps terminated | swap_agreement			2
Treasury Lock [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Loss on derivative instruments	$ 3,900,000
Notional amount		$ 250,000,000
Term of derivative contract		10 years
Treasury Lock [Member] | Cash Flow Hedging [Member] | Interest Expense [Member]
Derivative [Line Items]
Interest expense			$ 500,000