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Significant Accounting Policies (Detail Textuals) - $ / shares | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 22, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Significant Accounting Policies [Line Items] |  |  |  |
Common stock, shares authorized (in shares) |  | 349,000,000 | 349,000,000 |
Common stock, par value (in dollars per share) |  | $ 0.10 | $ 0.10 |
Number of votes each common shareholders entitled to provide |  | one vote | one vote |
Preferred stock, shares authorized (in shares) |  | 1,000,000 | 1,000,000 |
Preferred stock, par value (in dollars per share) |  | $ 0.10 | $ 0.10 |
Subsequent event | Dividend declared |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Dividends payable, amount per share | $ 0.10 |  |  |
Dividends payable, date declared | Jan. 22, 2019 |  |  |
Dividends payable, date to be payable | Mar. 11, 2019 |  |  |
Dividends payable, date of record | Feb. 11, 2019 |  |  |
Customer concentration risk | Revenue |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Description of customers accounted for concentration of credit risk |  | no customers that accounted for more than 10 percent of the Company's revenues | no customers that accounted for more than 10 percent of the Company's revenues | no customers that accounted for more than 10 percent of the Company's revenues
Customer concentration risk benchmark percentage |  | 10 | 10 | 10
Customer concentration risk | Accounts receivable |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Description of customers accounted for concentration of credit risk |  | no customers that accounted for more than 10 percent of accounts receivable | no customers that accounted for more than 10 percent of accounts receivable |
Customer concentration risk benchmark percentage |  | 10 | 10 |

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