Debt Commitments and Contingencies (Tables)

9 Months Ended

Sep. 30, 2016

Debt Disclosure [Abstract]

Schedule of Debt Obligations and Undrawn Letters of Credit Outstanding

Debt obligations and undrawn letters of credit outstanding at the end of each period were as follows:

	September 30, 2016			December 31, 2015
Outstanding loans under unsecured revolving credit facility	$	355,000		350,000
2.00% Senior unsecured promissory note payable	40,000			—
2.45% Senior unsecured promissory note payable	35,000			—
Note payable under acquisition agreement	15,000			15,000
Total debt	445,000			365,000
Less: Current portion of debt	(12,610		)	(62,050	)
Long-term debt	$	432,390		302,950
Undrawn letters of credit under unsecured revolving credit facility - face amount	$	36,267		36,266