Consolidated Balance Sheets (Unaudited) (Parenthetical) (Parentheticals) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Accumulated depreciation	$ 404,491,000	$ 397,210,000
Stockholders' Equity:
Common stock, par value
Common stock, stated value	$ 0.10	$ 0.10
Common stock, shares authorized	91,000,000us-gaap_CommonStockSharesAuthorized	91,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued	57,929,535us-gaap_CommonStockSharesIssued	57,708,675us-gaap_CommonStockSharesIssued
Common stock, shares outstanding	57,885,841us-gaap_CommonStockSharesOutstanding	57,649,609us-gaap_CommonStockSharesOutstanding
Treasury Stock, shares	43,694us-gaap_TreasuryStockShares	59,066us-gaap_TreasuryStockShares
Clinton place [Domain]
Accumulated depreciation	$ 7,444	$ 0

Face amount per share of no-par value common stock.

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