Derivative Financial Instruments - Changes in Fair Value of Derivative Contracts (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax:
Net loss recognized in other comprehensive loss	$ 8,214	$ 2,174
Derivative contracts
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax:
Beginning balance	9,238	3,548
Loss recognized in other comprehensive loss	8,356	2,130
Amounts reclassified from other comprehensive loss to earnings	(142)	61
Net loss recognized in other comprehensive loss	8,214	2,191
Ending balance	17,415	5,692
Interest rate swap agreements
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax:
Gain recognized in earnings	$ (37)	$ (47)

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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