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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Feb. 25, 2015
Common stock, authorized |  | 300,000,000 | 300,000,000 |  |
Preferred stock, authorized |  | 50,000,000 | 50,000,000 |  |
Preferred Stock, issued |  | 0 | 0 |  |
Preferred Stock, outstanding |  | 0 | 0 |  |
Common stock, issued |  | 43,519,647 | 43,412,660 |  |
Common stock, outstanding |  | 38,352,574 | 38,825,687 |  |
Stock repurchase program, number of shares authorized for repurchase |  |  |  |  | 2,000,000
Treasury stock, acquired |  | $ 10,268 | $ 23,711 |  |
Stock repurchase program, remaining number of shares authorized to be repurchased |  | 696,989 |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |  |
Beginning Balance, net of taxes |  | $ (93,015) | (101,498) | $ (55,249) |
Net actuarial gain (loss), current-period changes, before taxes |  | 9,622 | 8,406 | (75,016) |
Amortization of actuarial (gain) loss, amounts reclassified from accumulated other comprehensive loss, before taxes | [1] | 2,484 | 4,884 | (23) |
Effects of settlements, amounts reclassified from accumulated other comprehensive loss, before taxes | [1] | 4,155 | 501 | 0 |
Income taxes |  | (6,258) | (5,308) | 28,790 |
Ending Balance, net of taxes |  | $ (83,012) | $ (93,015) | $ (101,498) |
Treasury Stock [Member] |  |  |  |  |
Treasury stock, shares acquired |  | 580,100 | 722,911 |  |
Treasury stock, acquired |  | $ 10,268 | $ 23,711 |  |
Treasury stock acquired, average cost per share |  | $ 17.70 | $ 32.80 |  |
[1] | Represents amounts reclassified from accumulated other comprehensive loss. These amounts are included in the computation of net periodic pension cost. For additional information, see Note 9, Retirement and Benefit Plans.

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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