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Stock-Based Compensation - Activity and Status of Unvested Shares and Performance Units (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restricted Stock
Units
Beginning balance (in shares)	703,796	1,087,186	887,179
Granted (in shares)	247,521	190,557	918,884
Vested (in shares)	(470,019)	(571,481)	(705,508)
Canceled (in shares)	(21,514)	(2,466)	(13,369)
Ending balance (in shares)	459,784	703,796	1,087,186
Weighted-Average Grant-Date Fair Value
Beginning balance (in dollars per share)	$ 32.93	$ 33.64	$ 31.09
Granted (in dollars per share)	35.50	29.53	34.37
Vested (in dollars per share)	32.88	32.74	31.42
Canceled (in dollars per share)	34.16	33.38	32.14
Ending balance (in dollars per share)	$ 33.67	$ 32.93	$ 33.64
Total Vest-Date Fair Value	$ 17,009	$ 16,735	$ 24,155
Performance units
Units
Beginning balance (in shares)	318,549	0
Granted (in shares)	481,215	318,549
Vested (in shares)	(191,085)	0
Canceled (in shares)	0	0
Ending balance (in shares)	608,679	318,549	0
Weighted-Average Grant-Date Fair Value
Beginning balance (in dollars per share)	$ 28.41	$ 0
Granted (in dollars per share)	35.74	28.41
Vested (in dollars per share)	30.37	0
Canceled (in dollars per share)	0	0
Ending balance (in dollars per share)	$ 32.70	$ 28.41	$ 0

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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