Derivative Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Derivative [Line Items]
Expected increase to interest expense	$ 500
Derivatives designated as cash flow hedges in prepaid expenses and other assets [Abstract]
Interest rate swaps	0		$ 7,619
Derivatives designated as cash flow hedges in accounts payable, accrued expenses and other liabilities [Abstract]
Interest rate swaps	1,001		1,870
Amount of unrealized gains/(losses) recognized in accumulated other comprehensive income/(loss) on derivatives (effective portion) [Abstract]
Interest rate swaps	452	$ (3,635)
Amount of losses reclassified out of accumulated other comprehensive income/(loss) into contractual interest expense (effective portion) [Abstract]
Interest rate swaps	484	$ 795
3.875% (4.038% effective rate) Notes due 2027 [Member]
Derivative [Line Items]
Principal debt amount	$ 300,000
Interest rate (in hundredths)	3.875%
Forward Starting Swaps [Member]
Derivative [Line Items]
Amount of borrowings, subject to swaps			$ 150,000
Underlying treasury rate term (in years)			10 years
Underlying treasury rate locked by forward-starting swaps (in hundredths)			1.90%
Gain on forward-starting interest rate swaps	$ 7,300