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Retirement Plans - Safe Harbor plan (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Employees' savings plan
Matching contribution by the company (as a percent)		100.00%
Discretionary matching contribution (as a percent)	0.75%
Expenses recognized under 401(K) plan		$ 6,659	$ 7,948	$ 7,381
Minimum
Employees' savings plan
Age of employees to be eligible to participate in the defined contribution plan		18 years
Percentage of annual base compensation that participants may elect to contribute		1.00%
Maximum
Employees' savings plan
Percentage of annual base compensation that participants may elect to contribute		50.00%
Percentage of employees salary for which the company contributes a matching contribution		4.00%
Discretionary matching contribution (as a percent)			2.00%

X

- Definition

Represents the age of employees to be eligible to participate in the defined contribution plan.

+ References

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- Definition

Represents employee contributions to a defined contribution pension plan as a percentage of annual base compensation.

+ References

No definition available.

+ Details

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- Definition

The percentage of the employee contribution for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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- References

No definition available.

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- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

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- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

No definition available.

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