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Deferred Compensation Agreements and Stock-Based Compensation - Restricted Stock Units (Details) - Restricted Stock Units (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended			68 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018
Weighted Average Grant Date Fair Value per Unit
Accrued dividend equivalent units	5,121			5,121
Restricted Stock Units
Weighted Average Grant Date Fair Value per Unit
Units granted	403,985
Number of Units to Vest	201,864			201,864
Restricted Stock Units | 2019
Weighted Average Grant Date Fair Value per Unit
Number of Units to Vest	57,227			57,227
Restricted Stock Units | 2020
Weighted Average Grant Date Fair Value per Unit
Number of Units to Vest	11,067			11,067
Restricted Stock Units | 2021
Weighted Average Grant Date Fair Value per Unit
Number of Units to Vest	128,889			128,889
Restricted Stock Units | 2022
Weighted Average Grant Date Fair Value per Unit
Number of Units to Vest	2,340			2,340
Restricted Stock Units | 2023
Weighted Average Grant Date Fair Value per Unit
Number of Units to Vest	2,341			2,341
Equity Plan | Restricted Stock Units
Weighted Average Grant Date Fair Value per Unit
Beginning Balance, Weighted Average Grant Date Fair Value per Unit	$ 23.76
Granted, Weighted Average Grant Date Fair Value per Unit	25.53	$ 22.90	$ 23.87
Vested, Weighted Average Grant Date Fair Value per Unit	23.76
Ending Balance, Weighted Average Grant Date Fair Value per Unit	$ 25.03	$ 23.76		$ 25.03
Total fair value of Units vested	$ 700	$ 1,700	$ 600
Units granted	144,920	10,000	100,553	403,985
Number of units issued	28,471
Number of vested units	202,121			202,121
Number of unvested units	201,864	85,415		201,864
Compensation expense recognized	$ 1,300	$ 1,100	$ 1,600
Unrecognized compensation expense	$ 3,700			$ 3,700
Period to recognize unrecognized compensation expense	2 years 7 months 6 days
Accrued dividend equivalent units	5,121			5,121
Executives | Equity Plan | Restricted Stock Units
Weighted Average Grant Date Fair Value per Unit
Units granted				403,985

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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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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