Pension and Other Retirement Plans (Narrative) (Details)	3 Months Ended
	Mar. 31, 2019 USD ($) employee	Mar. 31, 2018 USD ($)
Defined Benefit Plan Disclosure
Number of employee participants | employee	1,400
401(K) plan
Defined Contribution Plans
Maximum pretax contribution per employee	100.00%
Defined contribution plan, employer matching contribution, percent	1.50%
Expense recognized	$ 213,000	$ 243,000
Pension Plan
Defined Benefit Plan, Estimated Future Employer Contributions
Estimated future employer contributions	$ 0