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Equity Compensation Plans - Deferred Stock Units Activity (Details) - Deferred Stock Units - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Units
Outstanding at beginning of period (in shares)	1,878,491	1,848,862	2,407,154
Granted (in shares)	670,254	565,921	565,061
Distributions (in shares)	(212,025)	(504,417)	(1,060,459)
Forfeited (in shares)	0	(31,875)	(62,894)
Balance at End of Period (in shares)	2,336,720	1,878,491	1,848,862
Weighted Average Grant Date Fair Market Value
Outstanding at beginning of period (in dollars per share)	$ 15.92	$ 16.46	$ 16.45
Granted (in dollars per share)	15.53	16.01	13.33
Distributions (in dollars per share)	18.37	18.09	14.64
Forfeited (in dollars per share)	0.00	14.80	18.66
Balance at End of Period (in dollars per share)	$ 15.58	$ 15.92	$ 16.46

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Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Distributed in Period

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

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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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