Fair Value of Financial Instruments Liabilities Fair Value Measurement on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation liability	$ 1,006	$ 929
Derivative assets at fair value	16,428	0
Interest rate swap liability	1,067	1,686
Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation liability	0	0
Derivative assets at fair value	0	0
Interest rate swap liability	0	0
Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation liability	0	0
Derivative assets at fair value	0	0
Interest rate swap liability	0	0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation liability	1,006	929
Derivative assets at fair value	16,428	0
Interest rate swap liability	$ 1,067	$ 1,686